....Hi Cass - I agree! I think that the Mk5 GTI/Ed30 in particular takes a lot of beating as a 'fun' car. The GTI is a great allrounder and is probably more tactile in its feel to drive (at least mine is!). I've been offered a drive in a modded new S3 (manual) by a friend and I'm going to arrange a test drive in a dealer's S-tronic S3 if only to get the worm out of my brain. I had a similar Mk5 R32 worm a while ago.
The other thing too is that the GTI is so iconic and has such a huge following of enthusiasts, although there are of course S3 enthusiasts but it's not quite the same.

I agree with your comments - sort of.
But I'd suggest that GTI enthusiasts are so just because of the GTI, rather than the entire VW range. OK, GTI owners may also like the Rocco or the Corrado too, but I doubt GTI owners would be so enthusiastic about the VW Fox.
Regarding the S3 enthusiasts - I would say they have much more enthusiasm for the entire brand of Audi, including all models, rather than just the S3, or S/RS models.