I owned an 06 GTI w/dsg. I would say it is more reliable and the interior is better. With that being said, once I drove the MS3 I knew there was really no comparison. The MS3 is a beast that will put a smile on your face every time you drive it. The GTI is more like driving an Accord.
So the guy that is trying to defend the CAI has only ruined one engine so far from hydrolock.....
Also, why would someone drive through 3 feet of water in a Corvette? I'd just park the car and swim to wherever I needed to go.