check out the total biscuit youtube channel http://www.youtube.com/user/TotalHalibut/videos he is putting out daily vids on what is worth buying and what isnt. Also a quick recap of what each daily deal game is so you can know before you buy.
So far I like Payday, it's a Left 4 Dead RPG-like shooter. There are different scenarios that you can choose and different weapons and perks to choose. It's pretty awesome so far, you just need friends to play it with.
Today, I'm looking at Ys Origins on the Flash sales, looks pretty interesting.