AIV valves at 89,000 ($650 each!)
Turbo died at 117,000 ($2,500!!!, AND THEN ADD ON LABOR).
Timing belt is a MANDATED REPLACEMENT BY NISSAN @ 60,000 or else you'll be sorry!
Great performance on this car.
Keeping it running can be expensive, this is more true on the turbo model. Today you can find a 300ZX pretty cheap, but be warned, it will have problems.
I don't understand your reasoning about reliability. The only things that failed were the AIV valves and the turbos (which is no surprise, 117k is a full life for turbos)...yet you gave it a 2 out of 10. Did you think it would last 149k miles with no replacements at all?