I just finished watching the first two seasons after starting a few weeks ago. I am disappointed in the series after so much fawning over it on this site. It just has too many slow spots. :shrug:
I do think there are some great characters, but IMO, it is an action oriented series with not enough action and too much drama and gratuitous nudity (which of course is fine, but really bfd).
Thoughts... The Imp character is great. The actor who plays Joffrey has made him a terrific villian. Kickserv's girl plays a great role. I think Sean Bean is a great actor, so it was a shame he got killed off. I think the Jon Snow and whole Nightswatch part of the series has been a stupid waste and very boring. The mystical part of the series (dragons, sorcerers, witches, white walkers etc) has not been explained and explored enough.