I bought my 2011 GTI this Summer and thought it did a fine job, even when it got over 100 degrees. I was concerned since it has such a small base engine. What also helped was getting a VAG-COM cable so I could roll down all the windows remotely before getting in. That was standard on one of my first cars, a 97 Jetta.
Coming from a car with climate control (Mazda 6), I still find it kind of annoying that this car doesn't have it. Then again, my Mazda 6 had a ticking time bomb under the dash, as the mechanical bit that baffled the air didn't always work right (a $1000+ repair). Sometimes keeping it simple is the way to go.