Watching the videos, it really drives home an issue I had with this game as a concept a long time ago: these characters are all from franchises with radically different art styles and demographics. They don't look like they belong together in this game, unlike in Smash Bros. where it looks like the characters could largely have a common point in origin.
And why did they announce the game with these characters, anyway? Fat Princess? Colonel Radec (a character who was only in Killzone 2 [and a brief cameo in Killzone 3's flashback intro] and was summarily killed off)? Parappa the Rapper? Really? You really want to have those three characters out at the start to hype your game over...say...Jak and Daxter, Ratchet & Clank, Sackboy, etc? I can at least understand why Sweet Tooth is there, because a new Twisted Metal just came out a few months back. Kratos is the most popular Sony character. Sly Cooper is just awesome and has a new game coming this Fall. Sony chose to unveil this game with at least half the characters being ones that modern Sony gamers probably don't know very well (if at all), instead of the beloved and well-known characters they do have.