It going to have some serious impact on the Steam landscape. I can predict a clean up of all the fly by night dev who deliver broken crap to the marketplace. The artsy hipster type who deliver a two hours game and expect $30 for it because "art" are also going to get hit hard. What I really want is Steam to strop treating game ownership like a one way street. If you own a game you should always be able to trade, gift and sell it to someone else.
from overview for madhi19 http://www.reddit.com/r/Steam/comments/2quaeo/refunds_are_coming_to_steam_whether_valve_likes/cna5y52