Yep totally normal kitten behaviour. If he's breaking the skin, he just needs to be taught that he's being too rough, and to settle down.

Heck, Nala is 4 now and she still attacks us! Haha she is crazy. She will hide under the bed and attack your achilles when you walk by, or even just mid cuddle decide thats enough and bite then run away. She's just moody. But unless she's full on serious, she rarely ever does enough to hurt us. And when she's all worked up and angry (tail swinging, pupils dilated, ears back) we can slowly move our hand towards her, and tell her "be nice" and she will (after much hesitation) lick your hand then settle down. And all of this behaviour is after being tormented by our housemate when we first got her as a kitten (he thought it was hilarious to "play" with her by making his hand look like a giant claw and bringing it down on her head from above - hence why she wont let ANYONE other than us try to pat the top of her head, she doesn't trust anyone at first).

But yeah, all in all, it's typical kitten behaviour. This kitten is not "broken", just needs a family who is willing to care for him properly and be the authority figure when need be