Look, I've been a snobby book fan in my time (most recently as like a week ago), but I thought that was a pretty great hour and a bit of television.
Was it the exact story that I'd like to see George tell on screen? No. But it was still damn good 'fun' and felt like the culmination of a lot of things that needed wrapping up, and for the most part they did it well.
I've really enjoyed season three. I thought the show was close to being a write off before 301 aired, but they've pulled it back and I'm very excited to see how they close this up in two years.
The show and the books aren't the same thing. That goes for GoT and HotD, and I imagine it'll have a similar bearing on AKotSK as we move forward with that. And you know what? That can be okay.
Provided what they adapt and change is well done of course; change for changes sake doesn't necessarily mean it's good.