I don't really mind the match-up of Marion on Dirk. First of all, Dirk is primarily a perimeter player. With his size and shooting ability, I'm not sure we have anybody else who is a better match-up, and if we do, we don't want to bring him out on the perimeter anyway. I suppose Bo Outlaw would be most fit to guard him, but do we really want 35 minutes of Bo Outlaw's offense? Plus, Bo only has an inch on Shawn anyway.
What you guys should be complaining about is that we need to make Dirk pay on defense. For a seven footer that can't bench-press much more than the bar, there's no way he can guard Amare Stoudemire down low, and he has no chance to stop Shawn Marion's quickness or keep him off the boards. The problem is when Dirk might try to guard Shawn and he just stands out on the perimeter bombing ugly set-shots. Dirk Nowitzki is a girl when it comes to battling on the defensive end. With his current hot-shooting streak, nobody can stop him from scoring. So, you have to expose the fact that he looks like Lisa Leslie on the other end.