I never got into Demolition, they were such a rip off of The Road Wariors, not as entertaining on the mic (Hawk was great in character during promos) or as athletic in the ring.
Midnight Express vs R&R Express were always great matches, back and forth, back when tag team wrestling really helped sell tickets and drive interest. The ME vs Road Warriors was also good because of the dramatic contrast in styles, the bad @#$ bikers and their super smart, deadly assasin like manager against the vintage chicken @#$& heels and their extremely wimpy, obnoxious manager. Both teams could go in the ring. The ME were legit enough that you didnt easily buy The LOD stomping them but at the same time you couldnt believe they were good enough to beat the LOD, it made you watch just to see how it would end.
R&R Express vs Tully Blanchard/Arn Anderson delivered some great matches, playing on the rivalry that existed a year earlier between the R&R guys and Ric Flair, Tully & Arn's co hort in The Horsemen. Tully & Arn had some excellent matches vs The Rockers in WWE although that feud was never as big a part of the show as what they did with R&R. Kind of funny in a way, WWE trying to replicate the dynamic between The Horsemen & R&R Express by having them wrestle essentially a R&R rip off team in The Rockers, the guys involved could flat out wrestle however, regardless of gimmicks
Hart Foundation vs British Bulldogs in the 80s was WWE's answer to Midnight Express vs Rock & Roll Express, with HF playing the skilled but cowardly heels, lead by their own obnoxious and extremely wimpy southern manager. In WWE this was pretty big circa 86 range, the matches were good, but not as intense as ME vs R&R. Some of that may have been limitations WWE had in general on performers back then, preferring a shorter, simpler, more power oriented match style over the more athletic, storytelling heavy style popular in the NWA. Certainly Brett Hart could wrestle as well as anyone in the US.
The Frrebirds vs Von Erichs and The Horsemen vs Dusty Rhodes/SuperPowers were more like gang warfare, 3 on 3, 4 on 4, etc matches that really were about the sum of the individuals and their rivalries more than a simple tag team feud. There were some big matches to be sure, and great moments, but this was not traditional tag team wrestling.
Although it was shortlived, The Mega Powers (Hogan & Savage) vs Million Dollar Team (DiBiase & Andre) certainly was big feud and big payoff match. I give it an honorable mention for how big the fued got at its height although it essentially served the purpose of furthering the eventual Savage heel turn and Hogan-Savage feud.
There are a lot of other feuds from way back when that were entertaining, that was just a period when tag teams and their feuds got equal time with singles feuds, when The Harts vs Bulldogs was getting top billing many times underneath Hogan in WWE, when R&R Express vs Midnight Express was amost equal to Ric Flair's matches in the NWA, a time when the wrestling shows in general typically had as many 4 major, top level fueds at a time, all promoted and pushed in a way that made them almost equal to what the two "Top Guys" were doing at the time. It helped make the product more entertaining, and quite frankly gave you something to be interested in when Hogan wasnt around.