It's definitely not for everybody. You have seen the worst part of the season, but if you didn't like it at all, you probably won't like the last part either. Even though some of the later episodes are truly epic. One of the best parts, speaking of Manu Bennet:
(Crixus screaming "Kill them! Kill them all!")
TV series usually have higher ratings than an equally good movie, though. The reason is of course quite simple. If you watch a bad movie, you usually finish the movie regardless and rate it. If you watch an episode of a show you don't like, you don't continue and maybe you don't rate it either since you haven't seen much. The ones who do rate TV series are mostly the ones who stick with them. I myself haven't rated a TV series lower than 7/10 on IMDB, because I only watch shows I like.