First let me say that I have a R33 GTR not an R34; but until last month I drove my GTR daily and thoroughly enjoyed it; however now that i only drive it once or twice a week i've realised several things:
-they're a pain in the ass during traffic and are uncomfortable over long drives (can't believe how much the seats cause my back to sweat, and the lack of airflow in the cabin under 100Kmh with the windows fully down is an absolute joke).
-seeing as the cabin tends to be quite hot you have to put the windows down in most circumstances, and in an R33 the design of the roof means any water sitting on top of your car will end up on your shoulder and legs as soon as you take any sort of corner.
-the unwanted attention and constant risk of theft and/or break in makes it impracticle to use all of the time, as you're running an increased risk of having your pride and joy damaged.
-the relentless baiting from hoons in their V8's, 4cyl Turbos, etc to constantly try and get you to race them at nearly every set of lights.
having said that, i love my car and I think a GTR is a fantastic drivers car. I am willing to put up with all of the negatives of the car because it is so fun to own and drive. Because mine is basically standard, insurance is quite cheap considering what car it is, and maintenance is also quite reasonable.
comparing the car to a 1996 ford or holden makes it clear how much better the quality of the GTR is.