This might be an unpopular opinion, but Eddie Gurrerro, as good as he was, is overrated by many due to his tragic death. Now, before anyone kicks off, he was a phenomenal performer. Great in the ring, full of charisma, but I wasn't a huge fan of his on the stick to be honest. He had a decent gimmick of 'Lie, Cheat, Steal' which made for some entertaining television. But Eddie isn't on the same level of the Rocks, Austins, Triple H's, HBK's, Angles, etc. They are all legends and current/future Hall of Famer's. Eddie, on balance, if he was alive, wouldn't be in the Hall Of Fame. He might have been someday, but I don't believe he's on that level. Like I said, very talented performer, but not one of the best.
Anyway, onto my list.
4. Rey Mysterio: Rey's early stuff was mind-blowing. Arguably the greatest cruiserweight ever. But he shouldn't be a three time World Champion. His first reign was purely a tribute to Eddie, and while the thought is nice, that isn't what a World title is for. I just can't believe him beating people like Orton, Angle, Big Show, and others in the main event.
3. Eddie Guererro: I know I've already given him a bit of a bashing, but Eddie's ability is undeniable. Incredibly talented performer who dealt with his personal problems and became a proper success story up until his untimely death. Deserves to be a World Champion, but he isn't one of the all time greats.
2. Chris Benoit: (for the purpose of this I'm isolating my personal views about Benoit) Benoit the performer was an incredible talent. One of the best technical performers in recent memory, his match with Angle at the 2003 Rumble is still a stunning match, as is his match where he won the title. He could seamlessly shift from one spot to another, and brought an intensity like very few others. Not the best talker, but he balanced that by simply beating the shit out of you.
1. Y2J: I'm biased, as Jericho is one of my favorites, but Jericho is the best of the four. Multiple time World Champion, Tag Champion, record-setting IC champion, first ever Undisputed Champion, and incredibly entertaining and charismatic. He managed to hang with the Rock during the Invasion, beating him for the WCW title, and famously beating him and Stone Cold in the same evening. Not only that, but he's evolved his character over time, rarely becoming stale, and has a great career outside of wrestling. But he always comes back.
He's the only one out of this list (possibly Benoit too, actually) that I'd put on a list of the top twenty wrestlers of all time.