I see there are really negative experiences made with this game
Let me tell you right now, they probably did a lot of updates till now so you will be able to play without many crashes(as for me, I play on my PC).
I constantly play the highlander and the only class I really hate to play with is the centurion, he has plenty of them moves you cannot block. That seems unfair to me, but I guess with experience you can counter everything.
If you have a class that you simply just loose against, try to play a couple rounds with that class you don't like and soon you will know everything you need to.