I, for one, am loving Capaldi. Deep Breath was hit-or-miss (mostly hit, thankfully, but nowhere near great), and while I disagreed with large chunks of the premise to Into the Dalek, I still enjoyed it and thought it did a great job of showcasing Capaldi's Doctor (more so than Deep Breath).
I get that the "darker Doctor" angle isn't for everyone (my brother decided not to continue after episode 2 as well), which is too bad because I honestly think that Capaldi's Doctor is wonderful. He's a dick to everyone and it's magnificent. Clara has much more chemistry with him than she did with Smith, and that's not a dig against Smith because I thought he was great (Series 7 as a whole is my favorite new-Who season so far, even though everyone else seems to hate it).
Moffat and Capaldi seem to be using Hartnell's Doctor as a sort of template for Twelve, with bits and pieces of Pertwee, T. Baker and McCoy thrown in to even things out. He's starting out as a distant, older figure, secure in his own superiority over everyone else (how many "no time for your shit" scenes have we already gotten with Capaldi?) which, of course, leads to his less accessible, more antagonistic nature. It seems clear to me that his arc will be about the softening of his Doctor, with Clara taking the Ian/Barbara/Susan role. I'm going to predict right now that Clara's departure will heavily echo Susan's when it eventually comes, and Twelve will be much more of a lovable old grandpa/mentor by then (but keeping more of an edge than Hartnell did in his last couple seasons).
All this, I suppose, is to say that I really like the direction the show is going. They seem to be reinventing the show by going back to its roots and letting everything (re)develop from there. Of course, I could be wrong and we might just end up with more of the same, but with a grumpy dickhead Doctor - which I honestly don't think I'd have a problem with - but I think people are jumping to that conclusion pretty early. Two episodes is too little to properly judge Capaldi's take on the Doctor. After all, he's been thinking about how he would play the part his whole life - there's definitely more to it than "grumpy dickhead Doctor," and I think we'll see that by the end of Series 8.