The first season had an excellent story, and writing in general in my opinion.
The acting was top notch, but perhaps the characters weren't, particularly—I felt they were mostly mouthpieces for some occasionally brilliant monologues.
Haven't seen episode one of season two yet, but I'm not too concerned if it was a bit slow paced and the characters didn't seem entirely engaging. With any luck there's a quality fictional idea behind the season that will show through as it develops.
I've been watching Game of Thrones the last week or two, and I doubt the development of the drama could possibly be as bad.