I'd rather have Marc Gasol (or Joakim Noah, for that matter) than Dwight Howard. Howard's physical talents are undeniable. I don't think I've ever seen a player with his combination of size, strength, quickness, and agility. And, yeah, he did dominate for a while down in Orlando, but in recent years, I've become fed up with his antics. It seems that whatever he's going through mentally is showing on the court.
With guys like Gasol and Noah, I just feel like they know what their roles are, they are always going to play hard, they are a couple of warriors. So, despite the downgrade in talent, there are at least two centers I'd rather have than Dwight Howard. That said, he's still only 27 years old. If he can get healthy physically and mentally, he can still be dominant.