Absolute best no questions non-funny cameo is [spoiler]Rachni Queen, which was so good I had to seriously consider redoing my ME1 Vanguard[/spoiler]
Yes yes yes yes yes yes
I would have said it was [spoiler]The mother fucking Wrex[/spoiler] but no, you're right, i totally lost it when she showed up.
Also the only really unforgivable problem with the game is that -- endgame spoilers, but you might want it spoiled -- [spoiler] if you pick "we'd better hurry" at the very end, you will probably lose teammates, and if you don't, nobody dies! awesome, thanks a lot for that, CANADA.[/spoiler]
Also fuck whosoever dissed shotguns. They're awesome... on the best class, Vanguard. Combining a really deadly short-ranged weapon with a teleportation power is a pretty obvious choice in retrospect. Hell, i'm really pleased with all the classes, except Adept, which i kind of feel is the "bad @ game" class for people who want to cast magic missile.