CM Punk vs Chris Jericho at WM 28. This definately wasn't the best match on the card as some said back then.
Almas vs Gargano from TakerOver: Philladelphia. Why was this 5-stars when HBK vs Undertaker wasn't?
Any Okada vs Omega match. Yes, they were definately great and maybe 5-stars, but going 6 stars, 6,5 stars was insane...
Reigns vs Cena. Just like Rock vs Hogan before that and Andre vs Hogan even before that, here we have a match that absolutely sucked but the fans loved it because of the names involved. Which raises the question: what is considered a good wrestling match? A match that gets the fans screaming or a match that is technicaly amazing and has great psychology?
IMO a 5-star classic should combine story, fan reaction, in-ring work, psychology and storytelling.
Also, Undertaker vs Triple H at Wrestlemania. All of them. The first one was a glorified brawl. The second one was a big battle, sure, but it wasn't the best match of WM 27. The third one was overbooked and Undertaker looked like an immortal that night. So much that 3 F5s 3 years later seem not enough to put him out. All of them were great, but not as great as people make them out to be.