I agree, the first half of season 1 was good no doubt about it, GGO was also pretty good meanwhile the second half of season 2 was pretty... Meh. The GGO standalone came along, i had my hopes up but was disapointed, they are really overexaggerating a game which i also found to be a problem in the other seasons. I have yet to watch season 3 but will most likely sit down and watch it at some point, fingers crossed it will redeem itself for all the damn rape scenes every SAO season.
Oh forgot the movie, it was okay but it still had the same problem as the series, overexaggeration.