The GTR looks awesome for those who know what it is. For everyone else, it just looks like an Impala (rear view) or Charger. And then of course they hear it.
The Z has been in a place of its own, reserved for things like Porsche's, since the 370. The 350 is nice, but not in a universally-loved sort of way. The 370 has few detractors, to be honest. It's priced much like the GTR, to undercut the competition that it *really* is targeting, and does it brilliantly.
The rest of the Nissan line is pretty boring. The Juke looks kinda neat for what it is, though. The Maxima looks fine, but I constantly can't tell some Altimas from some Maximas and that annoys me; much like the old Pontiac G8 didn't distinguish itself.
Then again, none of the rest of the line is looking to impact the sort of people who like the Z or GTR.