Cinemas, yay! As long as you can skip them. I'm also somewhat with Bill on the length issue, I like a longer cinema at the end of a game, but during the game, I prefer if they're kept in, like, the five minute range.
Interactive cinemas are something I like to see, too. The first time I remember seeing something like that was in the ending to Battletoads: Battlemaniacs on the Super NES. They stuck a mini-game halfway through the ending which determined whether you got the good or bad ending. Kind of fun. Resident Evil 4 does similar stuff in a lot of it's cinemas, which I think is cool.