weak? he has true snake form, chakra scalpels, intellect enough to trick kakashi in part 1, fought tsunade equally, sleep genjutsu, doton, all of orochimaru's techniques, manda II which is stronger than the original and finally "that jutsu" which coupled with edo tensei is supposed to make him invincible. and kabutos no moron. so yeah weak my ass. and kakashi isnt weak either.
well too bad for sasuke and itachi but kabutos been fighting 80 000 ninja by himself before they got here so all they did was defeat a cripple. and without sharingan sasuke isnt raping anyone so it goes both ways.