The thing is that the arcade as it is right now looks really amateurish, I tried to play some games, most of them had no instruction for the controls at all, other were ridden by bugs, other simple tests..
I agree that as a community is correct to leave people with the possibility to see their game published but there's a limit. People that don't know c2 may go to the arcade and say "ah this is not a good game maker, you can't make real game with it" and this detracts to your business and the overall image of the community.
On the other hand I see that as its the beginning of c2 not many finished games are on the arcade, but this is also inherent to the current state of it, I'll be publishing a finished (although simple) game on the arcade for the competition as a "lite" version and the full version on the chrome web store, simply because the lack of a leaderboard and the missing support for full screen are a deal breaker.
You really should think about this carefully because while it's true that you are building a big library of games in a short time you may also be scaring away "serious" developers, to be honest if it wasn't for the competition I wouldn't have even thought about publishing a game on the arcade as it really strikes as amateurish as other have said, and the risk of a full game (as ugly as it may be) being under an unfinished game may damage the image of a developer that invested time and money on a project.
My 2 cents.