C isnt fodder. sensing. medical jutsus, genjutsu. all of this requires a high level of chakra control and expertise
bee would have to disagree and so would itachi. he was good enough to break tsukiyomi and paralyse base bee. deidara also would disagree. danzo CLAIMED he sucked at it but what did he end up doing? he fell for it at a crucial point. C was trapped in one and couldnt dispell it because he COULDNT EVEN MOVE. the monster in the genjutsu held him down like when bee was in the shackling stakes genjutsu and claimed he couldnt move. even itachis never managed to shut down someone completely by looking at them. usually he wastes time putting them in some alternate dimension with crows and shit.
Seriously? I'd say Darui is almost on par with Kakashi.