Seriously, there's a thread like this and I missed it? I have been rewatching some of my favorites because some of those I follow are awaiting new seasons. In particular Log Horizon I cannot get enough of. Doubt its for everyone though, but there's a lot of nostalgia factor if you love to play MMORPGs. 10x better than SAO. Major is very underrated as well, its about someone's dream of playing for the Major League. Follows the story from childhood to adulthood, very up and down with all different emotions. Typical underdog story. Made me cry in some episodes.