Let's see:
>resisted by Steel
>only three types weak to it, none of them are known to be particularly defensive
>can go together with Dark or Ghost for near perfect type coverage, but it's not super effective to many Pokemon, as opposed to Ghost/Fighting, Ice/Electric (BoltBeam), and the Rock/Ground (EdgeQuake)
>no offensive priority move of that type
I don't see how you came to that conclusion, there's absolutely no reason you should even think that.
