The idea of having three roles makes total sense for a character like Deadpool, but it's all going to come down to balance. If one role ends up being way more viable than the others, players will just ignore the multi-role aspect entirely. It'll be interesting to see how it actually plays out in ranked matches.
It's a very cool game, even though I played it about 10 years after its release. Not long ago, I read that they are currently working on a remastered version. I would be delighted to play it again. It is worth the time spent.