I recently sat down and started watching Sword Art Online 2. Set a year after Sword Art Online, a player in the game Gun Gale Online has been killing top ranked players. Now Kirito and friends have to save the day. After watching 3 episodes I am looking forward to watching more episodes. The art style is the same as the first season, while the story feels more complex with more depth.
So far it seems to be worth the watch.