Marco's pizza was fantastic in the months after it opened. More recently (Oct, Nov, Dec 09), however, the pizza has been Americanized. Last time I was there there was WAY too much cheese. And, it was not fresh mozzarella.
The Vera Pizza Napoletana certification apparently needs more ongoing QC. I will periodically check back to see if Marco's is back on track, but right now I would not recommend it.