He's a very viable multi use weapon and he has proven it. He's been horribly misused in the last couple of years. The OC's essentially had a whopping three plays to run for him and once the defenses figured that out we saw the results we all are complaining about.
The dumbest thing to do with a guy like him is repeatedly throw the WR screen pass. Everyone knew if he wasn't going in motion that was the play coming. And if he was in motion then they knew it was a jet sweep.
When he has been play designed he has produced and yes in the long game too. And he has had less than stellar QB play, keep that in mind.