Dark Tyranitar
Is it progress if a cannibal uses knife and fork?
... What? Fighting and Bug are two of the best types in the game.
In my mind at least, there are very few good bug attacks or Pokémon, and not all that many good ones with fighting either. I agree that the types are useful if you can actually find good ones of them, but that is difficult to do.
Of course, it's been somewhat remedied in the 3rd and 4th generations, but I still think I have a valid point.