Favorite Wrestlemania: VI - 1st live PPV I ever saw.... Skydome (even on TV!) was immense; The Ultimate Challenge (The build up at RR, the saves they made for each other against Earthquake right through to Hogan going down to a 3 count), Demolition regaining their titles from Andre & Haku... Been better 'Manias in terms of in-ring action, but 6 is the first thing that comes to mind when I think WM.
Favourable mentions for XIII, XV, XVII also .
Best Match Savage v Steamboat (III), Savage v Hogan (V), Savage v Flair (VIII) HBK v Razor (X) (I haven't seen WMs 20 - 22 though so have yet to see the HBK/Angle or HBK/HHH/Benoit classics)... Piper v Hitman (VIII) was a bit of a fave too.
Most Shocking Moment (Reminded by a post above...) Taker hangin' Bossman after their HIAC match (XV). Real "what da fuck" shit.
Biggest Upset Owen beating Bret (X).... (Awesome, but always thought it sucked how JR played down the victory by saying that Bret's heart wasn't in it.) Loved it when he walked back out during Bret's celebrations too...
Best Main Event Austin v Rock (& Vince/The Corporation) (XV) - Stone cold regaining his title against all odds after a full year of Vince trying to take it away... The RR match, St Valentines Day Massacre the whole build up was awesome...
Worst Wrestlemania IX - As soon as it begain you could tell it was gonna be lame... All the ancient rome crap... Unremarkable matches, much of which were at WWFs gimmicky worst (Crush v Doink, HBK v Martel, the crap Luger bionic elbow stuff)... Then Hogan literally steals the show at the end (Having already pissed away a WM tag team title shot for a deserving team in the name of the pointless Money Inc. attack on Beefcake.... Had no bearing on anything except to set up that match and was always gonna end in a C/Out or DQ victory.). Was never really a fan, but that night spelt the end of Hulkamania to me.
Biggest Let down match Finish of Bret/HBK (XII)... Bret was 'robbed' and a match of such callibre deserved a undisputed victor. Tainted what in hindsight should have been HBKs ultimate victory.
Who made Wrestlemania? Vince, of course... (I'd argue that Wrestlemania helped make Hogan, not the other way around.)
Best Fued Rock v Austin is most notable to me as it spanned multiple WMs and maintained it's consistency/feeling even when they'd turned their attentions to other fueds in between.
Biggest Heel Andre.... 93,000 boos can't be wrong. ;o] Honorable mention for Bobby Heenan as well seeing as he orchestrated the main events for 2 & 3, played a part in what brough about the tournament for 4 as well as the subsequent early shower for Hogan, screwed Warrior for the IC title at 5.... Far more bad-ass than ya typical post-match heel attack.