We actually had a lengthy internal discussion over the merits of such a thing.
Basically, it boils down to the games being closed systems - no way to edit them, plus the vast majority of owners wont really know who to pass along an error report to.
So, it wont matter what was wrong with the game, other than it seems broken, so the only possible workflow is "alert its broken" > "remove game", and we figured that should happen rare enough that the admin should have noticed upon install, or someone can post it.
There shouldnt be any questionable content to report (since its not peer-supplied) so didnt seem worth adding a dedicated UI control, much less a whole submission form handling routine, for reporting a game.
What do you think of that?