well personally i think that the first 2 season were better then the 3 one...
I do like the story and plot of the anime, have not read the manga.
I like the way the main character get punished for only looking at other girls by his master and the way he like a commoner like himself beats down someone higher up and gain respect from the commoner (Commoner those without powers).
More or less that the main character get put in a situation were he was in the wrong place at the wrong time and then get punished....
Well i would tell you read the story of the anime watch the first season and if you like it then keep watching..