you're probably right about that. not only is it non-stop fighting, it's fighting without much emotional attachment - most of the time it's purely power-ups (ichigo vs renji, vs kenpachi, vs ikkaku, etc, etc). the main goal of the fights ? save rukia. and now save orihime. not particularly exciting.
i think one of the most meaningful fights was ichigo vs grand fisher - all the way back in the pre-SS days. and perhaps ishida vs mayuri.
yah, i was about to mention that. gantz has tons of characters, yes. but it disposes of them almost as fast as it introduces them. the characters that matter are few.
even claymore's creator knows how generic it is, lol. but honestly, you could accurately sum up most of bleach characters in three words or less.