Van Persie proved recently that you don't have to be super-pacey in order to get into goal-scoring positions. Villa may not be as good as him or Berbatov in deeper positions but he has footballing skills good enough to be a good fit there. On the other hand, his composure, finishing quality and movement can still get us 20+ league goals in a season which I would definitely not mind.
But, yes, I can't see him lasting for more than two seasons. But, I won't expressly mind him coming in and us getting a two year window to invest in a top striker who can be available at an affordable price.
He's not the ideal choice, but, also not someone I'd scoff at.