These are only 20 characters, that seems a bit low, eh? Maybe there'll be more in the final build of the game.
Raiden should be more fun to play than Snake, don't understand the complaints about him.
DMC Dante, no Lara Croft, no Crash, no Demon's Souls, no Team Ico and no FF at all is very disappointing though. Lara and Lightning would be free promotion for Tomb Raider and the inevitable FFXIII-3 but maybe Square just doesn't want to give them anything for whatever reason.