Its action and comedy is on par with One Piece, though its story/plot lags significantly behind. Whereas One Piece does not really have anything to not like, Fairy Tail has two things, excessive Nakama Power and Fanservice. Fanservice is ignorable, I would say 80% of the readers simply ignore it and don't pay too much attention, 10% actually like it, and 10% don't. I am one of the people who couldn't really care less. Excessive Nakama Power BS on the other hand does tend to get very annoying for me. The ratings can vary, if you are very into plot and less about action I would give it a 6/10, its plot is average, nothing bad or good about it, though the current arc did have several intresting events as far as story goes,its still significantly behind One Piece, Naruto and Bleach in this aspect. If you like yourself action and comedy over story, I would give this one a 9/10. Action is truly great, only noticably behind Naruto (out of the ones I read/have read) on par with One Piece and almost as good as Bleach. Comedy is also great, on par with One Piece and Naruto and above Bleach. My personal rating is a 7.5/10.
(Yes I have read plenty of manga outside of the Big Three, they are simply the best manga to compare to)
(Yes I have read plenty of manga outside of the Big Three, they are simply the best manga to compare to)