Thanks for the comments all, it's really interesting to hear the very differing views.
Cars at the end of the day are such a subjective thing. It's what makes forums such as these so interesting.
I must say, as I drive the car more, I am increasingly enjoying it, even with a few very minor faults.
I have discovered that Dynaudio is very input sensitive, and I have resorted to only the highest bitrate music I have. This wasn't something I was aware of initially, but it has made a big difference.
As mentioned, the GTI (or golf in general) is just such a brilliant all rounder. I would add that, in my opinion, it ticks all of the boxes that I require from a car and as an added bonus has some character and soul, which I felt has been missing from my last few cars.
I am looking forward to the summer coming and finding some dry roads to really enjoy the car!