The R32 was typical of the time - sleek, long planes of design, make it look low and wide, but completely devoid of personality. that is until you fiddle with wings and whatnot. I happen to think they look gorgeous because they are unadorned and focus on the functionality.
The R33 took a luxury route - and thus the car got a lot larger. they tried to give it more character with some sculpting of the wheelarches and a stroke here and there....it just ended up looking obese. It also bought into the 90's trend of integrated spoilers - see also the Toyota Corolla hatchback and Mazda Lantis/323 Astina.
The R34 squared things back up again after the Aerodynamic work of the R33 - which appears to be a backward step. however it became more masculine, easier to modify (square edges are always easier to match than round ones) and didn't end up looking too bad as a whole. however the car has so many shutlines - particularly around the rear "stove burners" - which genuinely look like R31 style tail Lights (ie; an afterthought).
Now this takes the worst of everything - it looks bloated, the rear lights don't integrate well, and it's characterless when seen from front on - and adds some pretty cool tech.
I suppose it's like the WRX - so ugly only it's mother could love it, but my god what it can do on the road. It's like the saying "ugly girls try harder"