OXCGN:
"It’s hot.
And I mean REALLY hot.
My English friends complain about the cold, rainy climate of England all while I’m sitting in Louisiana’s subtropical climate, with a “comfortable” 93 degrees Fahrenheit today (which translates to around 34 on the Communist scale) and 70% humidity.
In summary, you really shouldn’t be outside.
And we at OXCGN are here to offer a reprieve from the boredom that may ensue."
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Ad 
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But perfect gaming weather, so this will be helpful...
Alan Wake was one of the reasons I bought a 360, I was satisfied once it was finally released after being delayed for so long!
MGS Collection is another quality gem, especially for those like myself who never played the originals on the Playstation. Right up there with Orange Box quality.
Hopefully Metro 2033 gets a bit more attention once 2034 is closer to release.
I know it's a few years old now, but I think Enslaved: Odyssey to the West is a vastly overlooked game. Highly recommended to anyone who hasn't played.
I also recommend both Darkness games. First one's cheap, and I'd be surprised if #2 isn't down to $40 yet. They're both great on their own in very different ways (first is a lot more grounded in reality, second is like madworld with guns) and tell really good, dark stories, even if there are a few continuity gaffes between the two.
The original was criminally overlooked, such a worthwhile game.
The sequel is quite good in it's own right, although it is quite short compared to the original. Left it open for a 3rd game for sure.