WrestleMania 26 was one of the greatest WrestleManias in my book, and I've never understood the hate this event gets. There's only a handful of changes I would make:
1 - Cut the 10-Diva tag match, put it on the pre-show.
2 - Give that extra 8 or 10 minutes to Jericho/Edge.
3 - Put Chris Jericho vs. Edge immediately before Undertaker/HBK II. There was NO reason for John Cena vs. Batista to go next to last. Jericho/Edge had the story, the build, and the Rumble winner.