Robbie7

hmm... Microsoft getting advise for the MMO genre, it's only a thought but this could have some connections with Microsoft wanting to developing a online community for xbox live, much like playstation home.
only speculation.

Sorry wrong person @vanuslux

@markez
although you do make valid point, and i do agree that the achievement system is already getting abused. But many professional developers are trying to stamp out those very few games that have easy achievement, and follow the standard structure.
the problem with giving achievement access to community games is it will be extremely open for a random developer to put a very cheap game on the marketplace purely for one achievement (say for pressing the a button), and that would be all the games purpose is. Then many other developers may jump on the band wagon and start filling the market place with utter rubbish.

The lack of quality games is a real issue for community games. The reason it has no quality (or very little) is, unlike the iphone app store. It is totally open to the creator to publish on xbox live ,with on barriers of quality control. this may allow more unrecognized beginners to start to publish games. But the marketplace is getting very cluttered and hard to find those odd good games.
Although I'm not saying start quality checks for all games. if only we had a reviewing system much like itunes. we would be able to find those good games and give those other developers a standard to work towards.
@Miles
as for adding achievement, that would be a bad move. add would mess up the achievement system, by allowing people to buy games just for point to exploit the system. although Microsoft could possibly add a separate community score so people value the separate score less, or they could add achievement support but only for zero scoring ones

OMG. i knew it! I had this exact problem the day after the update. i was downloading PES 09 demo, decided to go on GTA. there was an update for it which sent me offline. then my xbox frooze after the update. switched it on/off, started freezing when my 360 was loading up xbox live. I tried switching it on and off like five times, at first i thought it was my internet. but by chance (with abit of knowledge) i decided to delete the download that was incomplete on my hard drive (PES 09 demo). I was back online straight away.

I think its selling well because there hasn't been any decent games in ages.
I was tempted to buy it my self, but decided not to. not long till the big guns come out! (gears,fable,farcry....)