There are plenty of fair criticisms of the writing in S1. There are plenty of reasons to say that a particular scene in the book would have been superior to what was ultimately put on screen.
But at the end of the day, that's picking nits. @WhiteVeils is absolutely correct:
Adapting a television show from a book is far more complicated than people seem to think. You have to think about the number of locations, number of sets, costumes, actors, filming schedules, time constraints, etc. -- all before you even get to which scenes from the books you are going to film, what you have to cut, and how to patch over the things you have to cut all while being able to get the exposition necessary for any fantasy series across without being ham-handed about it.
Season One wasn't great. But it wasn't horrible either. And nothing about the core story has changed so drastically that it can't be accounted for in later episodes.