Whatcar reviews (broadly speaking) are not complied by enthusiasts, but as you say, people with negative feedback. I've submitted three reviews to WC, two of which were overwhelmingly positive.

Anyway, there are several issues you'll hear about on here (PCV's, DV's, MAFs, etc), but all in all for a car of it's nature, I can't fault my GTI for it's reliability.
In 12 months, I've had to buy; 2x tyres, 5 litres of oil, a service, plus coolant and brake fluid changes :: less than £400 overall and TBH, if I'd done a bit more research first, I could probably have pushed the stealer to do the service and fluid changes before I took ownership. Ho Hum, lesson learned.
I would say enjoy your car; service it on T&D, give it the right oil, make friends with a decent VAG independant garage, use the right fuel and all will be well! Apart from the slippery slope...
