I've never read the books before. My wife read them back when they were coming out though, so she'd been really excited for the show to come out. It's been a long time since she's read them, and she never got to read the last few books due to real life time issues, so she can't necessarily remember all the details from the books and what all has been changed for the show.
Anyway, we've been enjoying it so far. I get the feeling she would prefer it if the show could slow down some and spend more time on some of this early material, but it's something like 15 books long, right? Even if the show is really successful and goes seven or eight seasons, that's still averaging 2 books per season. I can't imagine it's at all feasible for them to have any hope of covering the whole story and not feel rushed in comparison. If anything though, from my perspective, it feels like it's an awful lot of worldbuilding that I hope and expect will pay off later, but it just feels a bit slow-paced so far.