I finished the single player campaign this morning with a level 27 champion.
The good parts of the game (loot, cutting through hordes of enemies) make me want to go back for more, but the bad parts are really, really bad.
Like others have mentioned, ranged targeting is completely broken. Most of the large pulls towards the end of the game feel balanced for two (if not four) players. Three of the five boss fights are some of the worst I've experienced in a long time, and the other two only seem good in a relative sense. Implementation of things like status effects was abysmal. The sound mix in the third level was completely messed up for me as well - music dropping out, effects coming in and out, companion repeating his stupid combat lines over his plot dialogue, etc.
As a fan of SK's previous work, I'm disappointed.