I have one in a town of three that is not big on "sports cars". (This is the land of big "modified 4x4's)
So my experience is 50-50.
One owner of a red 2004 (with 5000 miles, currently for sale) stops to tell me all about her car and ask for help selling it. Very nice, a real pleasure.
The other owner of a black one, I saw in his car driving for the first time a couple days ago - like a deer in the headlights when I waved to him. I think he was at a total loss. I don't think he was being rude - just didn't know who the heck was waving at him.
Meanwhile in the Jeep it's almost too much - people even waving from across the interstate going 70+MPH and after a while it get's to be something like work... Different kinds of people I think. The Jags were the same way - every Jag owner (well the XKE anyway...) would wave, or even chase you down and stop to tell war stories...
These days people are a bit scared of strangers. Sad really... Get a Jeep - you'll get waved at more than you can stand!