He can play C in the NBA. he wouldn't be able to guard say Shaq too well. But considering 90% of all NBA centers are either jumpshooters (Aldridge has the necessary length) or players with no offensive skill whose only offensive weapon is offensive rebounding, which Lamarcus is a fine rebounder, I think he'd do fine.
And as far as I know he's the biggest guy in this draft, right? There isn't any thought involved in this pick. Aldridge is the guy. If Lamarcus can't play C, Bargnani can? The only thing other than drafting Aldrige they should look into is to trade that pick for JO if Bird keeps that deal on the table.