As a CoD hater, even I gotta admit BlOps' ending is pretty funny. Funniest ending ever? Probably not. And nowhere near best ending period. The other CoD's probably don't deserve it either. MW3 might come close though, in like a top 200 list maybe.
Only a few games on that top 50 I feel deserve to be on a list like this: Twilight Princess, MGS1 and 4, SotC, Kingdom Hearts, Portal 2 (both single player and co-op endings), SMB for the nostalgia vote, and maybe Sonic Adventure 2, FFVII and OoT. Everything else (the endings I know anyway. Haven't played things like Heavy Rain yet) ranges from meh to just plain no. I think a comment on another site (this news is like a week old btw) said this list plays out more like a "which is your favorite game of all time" list, which makes a lot more sense. This is totally the kind of list online viewers would pick.
Just chalk it up to Guinness failing yet again at vidya games.
Sonic the Hedgehog is on the list. I am curious if they mean 1991 or 2006. Both endings are dumb either way, Just Saiyan.