I have to disagree that aging the characters was a bad move, though I think they made Jon look a little too old. He looks in his early 20s with that bloody beard, but I can't argue that I dislike it. I think he was a good choice of actor, especially considering he looks like Sean compared to the actor who plays Rob and Bran who resemble Catelyn much more than Ned.
The Hound definitely needs more screentime, they kind of throw him away in the series by trying to portray him too much like Joffrey's lacky. The chapter where he takes Sansa and he rambles about how he got the scars would have been much more powerful if they actually showed that rather than have Baelish comment on it.
I'm not sure what to make of the actor for Baelish. He seems to match but his performance feels.. like it could be better, but something is holding him back and I'm just waiting for him to shine. I see why he's doing it, but it doesn't come off as well as it could.