If it had ended after Soul Society arc, it would've been perfect shounen, with it's kinetic battles, great visual designs, characters realized just enough to be interesting and having room left for growth, emphasis on improving oneself, power of friendship, and all that other target demographic crap. As stupid as it is, even after ten years i think of Aizen slicking his hair as one of the coolest manga moments in general, period - self conditioning i guess.
But well, it went on after that. And on and on, and on and on. Until it became shadow of a shadow of a shadow of what it used to be in the beginning. I plan to reread it somewhen in the future - i stopped around volume 50 or so - but i doubt it will make me happy.