Bret was over with the crowd, however Vince wasn't sure he would be a big draw because of his size. So while he was champion many times he wasn't the main event match, or if he was it wasn't the most heavily marketed one.
Survivor Series '92 Michaels vs. Hart went on last but the 'big match' was Flair/Ramon vs. Perfect/Savage.
Royal Rumble is an exception as the Rumble match is always the highlight.
WrestleMania 9 he was the main event but lost the title.
He wouldn't get the title back until WrestleMania X.
KOR 94 his match with Diesel was in the middle of the PPV.
SummerSlam '94 is criminal in my mind as the epic 40 minute Brother vs. Brother case match should have ended the show, but instead it was the stupid Undertaker vs. Undertaker gimmick that did.
Survivor Series 94 again Backlund vs. Hart was in the middle of the show and Taker vs. Yoko Casket match was the main event.
His 3rd reign was better as he main evented all the PPVs between when he won it (Survivor Series '95) until he lost it (WrestleMania XII), however the January and February matches were used more to setup Diesel vs. Undertaker then an actual Championship feud.
His 4th reign lasted a day so we won't count that one at all.
His 5th and final reign also saw him just have bland matches outside of the bookends.
Summerslam '97 beat Taker for the title (with 'help' from Shawn)
Ground Zero he faced the Patriot in a pure 'we need to give Bret a match' match. While the main event was Taker vs. Shawn
Badd Blood had the first ever Hell in a Cell main event the show with Bret and Bulldog in a tag team flag match again Vader and the Patriot.
Survivor Series '97 Bret kicked Shawn's ass and all was right with the world