Played this last Saturday with my Brother and Sister, I tried a few characters and just mashed some buttons hoping I could do some damage.
We didn't practice, as it was more fun to just jump in there and hurt stuff.
I started out with Jak, not really that interesting just like in the games. Then I was Ratchet, taking people down with a well placed Ryno was really fun with music and everything. Then it was Nathan Drake, he is my Favourite so far, he just have some fun and interesting moves. I was then the chick from Heavenly Sword, yes I don't even bother to remember her name as I don't know the game either.
We didn't play for long but the game was really fun, just a little sad that there is no single player co-op campaign like Super Smash had, that was my favorite part of it.