Things like top mounts and bushes are just wear and tear though, things like that always need replacing over time.
I've never owned a mk3, so can't comment, but have been very happy with the mk4. The waterpump went the other year, but it's a pretty common fault, so I had it coming to be honest. Door module broke too, had to get a new one.
That aside she's been very good. Just old age wear and tear of the rubber parts. I think it's the luck of the draw as to what you end up getting.