Fairy tail is mostly repetitive and lacks a story. Power ups more random than super saiyan level 5 and when you got a fairy tattoo it means you can't lose a fight. I liked it at the start , but now I think it's a load of crap full of fanservice sideboobs and cameltoes.
Bleach may have a bad period or maybe even since the Aizen arc, but I think Bleach achieved more than FT.
Besides I think Fairy Tail already is on the way back. It scored good last year, maybe we are in for another good couple of years but if Hiro isn't going to spice it up somehow it will drop harder than Bleach.
Remember chapter/episode 1 of Fairy Tail ? Lucy was the main charachter, somehow Natsu took over and made Lucy pretty useless.
Fairy Tail is fun when you want to catch up in filler season of Naruto, but nothing more than that. The anime has pretty good animation and the manga is drawn well. The story is shallow just as the charachters.
1. One Piece
2. Naruto
3. Bleach
4. Fairy tail
(If I could pick from all the manga I read Bleach and wouldn't be in the top 5 and FT wouldn't be in the top 10)