Sure but Skylines are great 'bang for buck' packages. Not let down in any real areas or compromised, you have a superb engine, strong transmission, decent balance and handling, reliability, room for people in the back and a bit of space in the trunk. Add to that there are loads of mods available and everything about the cars is 'well known'.
Sure there are faster and there are better handling, but you will have to pay ALOT for something significantly better at both and that will probably cost $$ to run. Sure you could buy a V8 but then it would be heavy and crap in the corners, or a nimble little two seater which probably wouldn't have room for a briefcase in the trunk and people would think you are a hairdresser.
Plus also Skylines have a tough 'aura'.