I don't understand how people think Kenpachi is weak by default just because he lost to Ichigo early on.
It's like saying a person is weak/skill-less just because they lost to a master in the first round in a tiered tournament because they had shitty luck instead of their lack of skill.
Kenpachi and Ichigo went all out and (nearly) killed each other resulting in a tie (even though Kenpachi says that he lost). That fact is not a reliable way of comparing relative power levels, let alone be logical. Who the hell pulls these arguments out of their asses? I know that I'll get responses of "lol 12yos and shonen", but seriously, if you're 12 years old, you should be smarter than that.