Why I don't like Kenpachi
I kinda got soured off Kenpachi during the "Rescue Orihime" arc, where he was revealed to be the most ridiculously over-powered Soul Reaper since Aizen.
Okay, bear with me here - way back in the Soul Society arc, when Ichigo first battled Kenny, both combatants ended up going all out on each other - Kenpachi took off his eye-patch, summoned his full spiritual pressure, all that good stuff. They fought to a draw. And this is back when Ichigo hadn't even heard of Bankai yet, and his hollow mask was still nothing more then a developing plot thread.
Several hundred chapters later, a Bankai'ed, Hollowed-out Ichigo barely beats a high ranking Espada, only for another, even more powerful Espada to come out of the woodwork. Just when all seems lost, Kenny shows up and beats this new, more powerful enemy.
Wow! How on Earth did Kenpachi get so much more powerful so quickly?! To beat an opponent Hollow Ichigo probably couldn't - don't tell me he's learned Bankai too!
...well no, no he hasn't.
Well, uh, at the very least he's learned his sword's name, right? Combined with his already epic amounts of spiritual pressure, Shikai alone could explain his sudden boost in power!
...except that he still has no idea what his sword's name is.
So Zaraki Kenpachi is just... somehow... magically ten to twenty times stronger then he was when we first met him; there's not even a justifying line like, "I've been training hard since we met" or something, it's just, "I'm going to kick you're ass." BOOM! "Heh. I kicked your ass."
He's as strong as the writer wants him to be, he takes ludicrous amounts of punishment with a smile, and he beats up opponents that should, by any sane logic, mop the floor with him. He's the frikkin' Wolverine of the Bleach-verse.