Seems like a cute little game so far, but I'm still not sure how much depth/replayability it will ultimately have.
I've no problem with playing a free game that uses the micro-transaction model. If rich players want to pay Blizz for BIS gear(or whatever) then that's good because it funds the game and incentivizes more game development in the future, which means more content.
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Oh ya I guess it is relatively dark, and gory. On the character select screen I clicked the female Barbarian and it shows an animation where she plunges an axes into the heart of a monster. I don't remember anything that gory in previous Diablo games.