I am not sure I agree entirely, I was quite happy tracking the 350 as many members do, for what it is, I.e a nice comfy road car, it is very capable on track, but thats pretty much all I was using it for, so there were cars much better suited to the task.
I guess it comes back down to which boxes are the priority for being ticked, but if those boxes need ticking in equal measures, a charged 350 ticks them all and for 370z money or less i would much prefer the former or 135i.