Warrior is a great shout for most people along with Hogan and UW did do a lot, but most of his "good work" was done the year prior... He's very much up there for 89-90, which no doubt we will get to shortly
but he'd peaked the moment he won the belt and he needed others to make him look great and dominant.
The contenders for me are:-
Randy Savage - This was Randy's best year on the roster in a while, he was still the Macho King and not quite as featured as he had been, the work he did with Dusty Rhodes was excellent and repositioning him for the Warrior feud. The thing that stops him being MVP is that awkward absence from Survivor Series. There might have been an injury but Savage is a glaring omission on that card if he wasn't hurt. When he was back on TV he was positioning for that title shot from Warrior and when he didn't get it, took matters into his own hands ending his reign and being the crucial part of Warrior's best match.
Whatever happened in fall 1990 arguably led to his "retirement". It wasn't touched on in the recent DVD, but is post Liz split "funk" was, so perhaps this was a similar situation where Randy needed some "time out" or to try to "save his marriage". It's a shame cos Savage was rarely better than during that year in the ring.
Kerry Von Erich - Kerry was a replacement of a replacement for Summerslam 1990. Brutus Beefcake was due to win the IC title but his horrific accident put paid to that. The recently signed Davey Boy Smith was next, but he was also rehabbing injury and couldn't take the match. So they went with Kerry Von Erich upsetting Mr. Perfect instead... and while it didn't last into the following year, for those 6 months or so until Mania 7, The Texas Tornado was EXTREMELY hot with the fans and surprisingly good in the ring. You never realised he was an addict or had one foot. The wheels came off after Mania 7. With hindsight I guess once the initial push ended his motivation to stay "straight" dropped and his old demons surfaced. Not being there the full year stops him winning, like with Savage. But credit where due, Kerry was the first former NWA World Champion to cross over to McMahonland and be allowed to lift a title, something Harley Race, Dusty Rhodes, Terry Funk didn't manage.
The Rockers - I mentioned them in a prior thread over their final year and again, they get a mention this time. While the Hart Foundation were arguably the best tag team in the World at that time and LOD were on their way in, it was the Rockers who were doing the lions share of the work in the tag division. Helping to get new heel teams like Power and Glory and The Nasty Boys over in particular. History shows they jobbed the whole year, but that's not what was planned. This was the year the Rockers DID win the titles in that sadly ruined match where the rope botched. The Rockers were being given the ball, arguably because of Vince's financial problems with Jim Neidhart admittedly, but they were still being given that ball. Neidhart stayed and they got the belts back and history shows the Rockers never winning it, there's a strong case for the Harts being MVP's too but on balance, even without the titles the Rockers did a LOT of great work underpinning shows and got themselves majorly over. They were like modern Chris Jericho, valuable as plucky loses and as popular winners. This was clearly the period both guys earned the opportunities they were given later.
Rick Martel - Martel had split from Tito at Mania V and was clearly destined for a push when his wife became sick and he had to depart for a spell. When he returned at Mania 6 he picked up like he hadn't missed a beat and quickly became an important member of the roster. He wasn't the "top guy" but he was, like Honky Tonk Man, Greg Valentine, Rick Rude before him a heat magnet, strong worker and able to occupy upper mid card faces with strong feuds. His feud with Jake was a major, major part of that years WWF programme... while the end result was the disappointing Blindfold match, this period also saw Martel captain the first Surivor Series team not to lose a man and take part in the memorable Final match, getting some face time with Warrior, Hogan and a nice coda to his feud with Tito Santana. Rick was great during that whole "Arrogance" phase, while Jake played his part he was off-screen for most of the feud selling the blindness so it was Rick having to do the work of becoming more hated in his absence. He doesn't win it cos of who does... but he has a strong case.
The winner however for me is not up for question and I think most will probably agree once I'm done... It's technically 2 guys but as we're talking about wrestlers...
The winner is... Mr. Perfect w/Bobby Heenan.
This was Curt Hennig's banner year although he had shown flashes during his mini run with Hogan and feud with Beefcake to that point. With the Perfect record gone, one tweak was made that "rocket boosted him" They changed The Genius out and put him into the Heenan Family. Immediately his stock rose, Heenan was still the top manager in the game, even if he was reeling from Andre's turn on him at Mania 6 and this was reinforced when Perfect was the one to win the vacated IC title. Heading into Summerslam 1990 things looked extremely rosy in the Heenan Family, Perfect was the IC champ and Rick Rude was headed into his cage match against Warrior. This brought out the best in Heenan and thus Perfect benefitted a lot.
After Summerslam another shock had seen Kerry Von Erich defeat him and Rick Rude walk out of the company, furious at not being given his chance to headline Mania 7. Most agree with him, but it left Mr. Perfect as not only the crown jewel of the Heenan Family but the top heel below Slaughter and Savage as Earthquake and Ted DiBiase's pushes had stalled and Undertaker had yet to debut.
Rude's departure probably helped him regain the IC quicker than planned, but Perfect was put into the Survivor Series match just before this with Warrior and the newly debuted Legion of Doom. He was a strong, credible opponent for Warrior in that match, although not strictly his feud...
Once that was done, Perfect carried his second IC title strongly and began a feud with Davey Boy Smith at House Shows... WWF Magazine made a cover of the upcoming IC battle between them, but injury again derailed it and arguably is the main "blip" in an otherwise "perfect" year for Curt Hennig in WWE. The originally planned match for Mania with Smith had to be changed by a combination of Smith not being ready in time and Rude's departure. So he was put against Big Bossman... The match itself was fine, if not quite a classic... but Rude v Bossman and Curt v Davey at Mania 7 could have both been great matches. Curt soon was hurt and having to put over Bret at risk to his career... if he hadn't had such a great year in this period, WWE would have just taken the belt off him sooner and gotten it onto Bret another way, but because he had been their true MVP the year the rub Bret got by beating him could be seen as the turning point for the WWF... If Curt isn't MVP that year, Bret doesn't get over so quick, arguably Summerslam 92 doesn't happen and he never becomes World champ... if Curt doesn't get hurt... it's HIM getting Bret's push cos he was that MVP...
Good as Bret became, imagine Perfect in World title feuds with Ric Flair, Randy Savage, Bret, Davey, Ricky Steamboat...all off the back of that "perfect year".