Regarding picking on Uc3: I played and completed the SP in the first week it was out and sold my copy (so I can buy the GOTY version when it comes out) so I don't know what's been added since then. But I feel from my experience playing through the game, it was severely lacking. I'm not talking about all the fancy edge of your seat stuff in the campaign, I'm talking about the extras outside of the actual single player campaign.
In Uc 1&2, you unlocked artwork, making of Videos Concept arts, costumes, "cheats" but in Uc3, there was none of that. No, 3D doesn't count primarily because I, like most people don't own a 3D tv so it didn't do me anything, apart from that, I can't think of anything else exclusive to the single player that wasn't there in the previous versions, save for more bugs.