I won't write a review but I will try and answer your questions.
It doesn't feel repetative to me, infact some levels don't involve combat at all... chapter 3 is not a combat level.
Level design is far from sloppy, while linear, there are always options for different approaches. enviroments are indeed pretty. The immersion factor is awesome, you get to listen in on some conversions, this adds to the immersion factor.
Physics based magic is a great idea, nice to see it done so well. Melee combat feels very kinetic and it's not at all repetative. You could certainly sneak around aswell.
It's great when you get mobbed, you really have to pick your target and moves well.
Yes I think it's a very good game, despite the bugs, if you're dubious wait or the patch.
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Me want....