Sorry, but 3DGS even on showcase we don't see lot of finished games or games. Go to Unity Showcase and see the difference.
Strictly speaking, the simple
amount of finished games isn't necessarily a good metric regarding whether an engine is good or not. Perhaps a "finished-games-per-experienced-user" would be more applicable. Not that any data for that exists.
(I'm not saying here that Unity is or is not better than Acknex - I don't have enough experience with Unity to say. All i'm saying is: Statistics!)