Anyone that gets there nipples in s twist about having to shell out on a bit of money for a few faults is thinking about motoring the wrong way, cars have things to fix and parts that wear out this is life nothing lasts forever, the key thing is are these things consumables and wear and tear.... In my experience I've never had an issue with any mechanical part, is that because I'm mechanically minded and the car gets treated very well? Possibly but essentially it's how you treat any car.
In answer to your question these cars in my experience are hugely reliable and put up with hard spirited driving, are very well complimented spec wise, lets not forget the very high demand forbthe cupra r when it came out, dealerships were packed when the cupra r was launched and they had a better driving
review than s3's of the same year, great build quality, desirable looks, these cars are amazing I'd buy one again and again... Certainly better than all the cars you've mentioned as I have driven them all.....