Agreed great show both Season 1 and 2. I just finished the last book he wrote Dance with Dragons which I guess would be season 5. The series is based on the books and very true to them in almost every detail.
One word of warning. This show and books do not give any regard to the reader or watchers attachment to characters. Characters that seem integral to the story are killed off without warning reasonably often. Sure keeps it interesting.
Don't know why, but I just couldn't get into it.
I thoroughly enjoyed HBO's other offerings like The Wire, Deadwood and Boardwalk Empire... so it is a huge surprise to me that I didn't enjoy it.
Maybe I should try again
Season 2 gets very complex with lots of players and side plots which makes it hard to follow week to week.
A complete bluray would be the shot and watch it in one go..