^^^^dude i think its because the mk 3 was never as loved as the mk 2..
my 1993 mk 3 has absolutly no rust anywhere, and mine is the non galvernised one (early), but as you say, theirs some nasty condition ones around, but their is mk 2's as well, just not as many coz theirs not many mk 2's left!
i had a mk 2 valver in 1995, was great car but to be honest my mk 3 handles alot better...maybe because iv got a aftermarket set up where as the mk 2 was totally stadard
in my opinion neither the mk 2 16v, mk3 8v /16v nor the VR6 are amazingly quick anyway, so just go for what ever car you personally prefere, it really is as simple as that....
if the mk 2 was so good, whay are you on here asking people to make your mind up for you, coz thats what your doing..