Here's how I look at it...
When I first saw the Mk5, I was like meh. However, when VW launched the Mk6, the styling difference was absolutely incredible. The MK6 caught my eye every time that I *rarely* saw one. In 2011, I was driving home from work and this dude was pulling out of a lot with his MK6 GTI and instantly I knew that I HAD to have one. It was almost like a real-life commercial, it was angled in a way that I could see all the sexy curves, etc. A few days later, I went down to my local VW dealer to make sure I wasn't hallucinating, and when the rep pulled my GTI around, I knew I was going to buy it before I even test drove it.
The MK7 doesn't do that for me, and there have been a few similar moments where it had its chance. I'm sure its a fantastic generation, but my loyalty remains with my Mk6.