Check the particular year and model you wanna buy and search online to see if they had any issues. Check also the engine and transmission online and see the reviews. From that you should be able to make an informed decision.
Lakini kama ni CVT, run.
I dont know why people complain about these cars. Its probably model specific issues or engine specific since in my 5 years of owning a Skyline, I have had 0 issues apart from changing the consumables like brake pads, gearbox oil, replacing the coolant and such.