Just a really fantastic game. I've finished the main campaign and the new Temple of the Sun campaign on regular difficulty and have 55 hours total. Plus a bunch of tries to get Survival mode down. The different characters really all do play quite different, have beat it with the ranger and the priest.
The few downsides is that the game tries to beat you mostly with numbers of enemies rather than very intelligent ones, but still remains quite challenging especially on hard (and survival mode is BRUTAL). The other thing is that there is no actual reward for killing enemies, they are mostly just obstacles for you to explore for loot and secrets.
That said, I loved this game in single player and it's even miles more fun as multiplayer. Hope they get another new campaign in the next patch.
Add me if you want to play!! stewnwt