The Nissan 3.5L seems to have a very high rate of timing chain failures.
Not true at all.
Now if you stated oil consumption... sure 100% on that. Ive been on many nissan boards with a 3.5L powerplant and i dont see anything close to an alarming rate. For a while i did see more then my fair share of oil consumption, 1qt every 1000 miles or less. Minor issues here and there with the VQ but mostly body/chassis related.
My VQ30 in my maxima has 140k and my VQ35 in my G35x has 80k, both are roughly engine-free issues. Rust on the maxima is catching up. The G has minor electrical stuff. Other then the valve cover and intake manifold gasket its been smooth sailing.