The new dynamic and quite vibrant look and feel of things does really fit this point in the DMC timeline, at least to me. I do agree on difficulty as i really loved the first devil may cry.
For the enemies we have seen yes i do agree for the most part they do seem somewhat slow to react and rather laid back, although that may not necessarily be true for other enemies.
The only part of this game im a little cautious on, this far, is the new dantes attitude. He swears a lot and isnt quite as witty etc as the Dante we know, however he is young, isnt as experienced etc so it does fit although i am a little worried it may be overdone and just get annoying after the first few levels.