Maby,it's actually because after the fall of the Espadas,it became boring.
plus,they way the Espada members died was pathetic,especially Halibel,Espada #3.That's was disappointing.
Sorry to see a popular series go down the drain, but I guess there is only so many times you can "become more powerful and pwn them all". :D I stopped watching after he beat Grimjow, I already thought the Bounto arc was boring in all honesty... you'd think they'd learn from DBZ and not do the same Get Beaten, Power Up, Beat them, Rejoice, Get beaten again, power up again - boringness...