It's a vDub reliability is hit or miss.
For example, my 98 Passat 1.8T has been virtually trouble free. After 5+ years of ownership and 62k of my own miles (has 115K on it now), I've spent maybe about 500 bucks on "repairs" everything else moneywise put into it was regular expected maintenance, and mods too.
Though on the other hand, my friend had an 01 Passat 1.8T and after 60k miles he had to replace the motor, due to sludge.
I love the VR6 motor in the the MK4 Golf/GTI/Jetta, I wish it was available in the B5 Passat. IMO it is more reliable than the 1.8T, but again it's a vDub so unfortunately shit happens.