I watched the first two seasons. For a show with such great animations, almost all the fights were incredibly boring. There were only two that actually kept me interested, that being against the Female Titan and when one of the other students turned into the smaller titan that was really agile (I forget her name).

The lead character I find uninteresting as he really only seemed to show two emotions the entire time, and the comedy relief the show throws in feels so out of place.

Not to mention the 'twist' that the titans were all originally people I saw coming since the first episode.