Speculators have driven up the price of MK4 R32s to insane levels. It was a dreadful car dynamically, which was not universally praised at launch due to it's many flaws. Heavy, slow for it's spec, soggy body shell, rubbish 4WD system, poor ride quality and very thirsty. It was an 'interesting' car with and interesting engine and made in limited numbers, which just about earns it a slot in classic land......but as a drivers car, it was awful. Decent FWD hot hatches rang rings around it. It certainly was not a 'great' car.
The MK5 GTI on the other hand, most definitely was a 'great car', universally praised and everyone loved it. That is 100% a criteria for earning classic status.
Give it 10 years and mint ones will be fetching good money.