Certainly Muk's 413 HP and 298 SpD are not sub-par. Or 415 HP, whichever it is.

Steelix sucks wang, and his Rock Slide is weaker than Donphan's AP. Note that Donphan's AP blows donkey balls as it is. Also, Steelix sucks wang. Explosion is the only good thing it can do, but there's other guys that can Explode while having the ability to do other stuff at the same time. So, yeah, Steelix sucks wang.

Steel attacks are weak and suck wang anyway.

Don't steal my secksee CB Azumarill, you sucker of wangs.