Wow, I've never had the car running when I get there, but then again, I'm just a 5*, so maybe that's only the PC level of service. The trunk is usually open, though.
I can't complain about the upgrades, although it does seem that this year, I'm usually getting the bare minimum upgrade. For instance, if I rent a full-size, I get a full-size with leather seats, or something like that (YF, I think is what the class is). In 2004, I had a few instances of renting a full-size and getting a G35 or Avalon. Not so far this year. But, again, I can't complain. My rentals are always under the canopy, and freqently in the PC section at O'Hare and STL.
One thing I do notice, is that when I have a one-way rental, it seems like I get a car the airport or HLE wants to get rid of, like a Taurus with 20,000+ miles on it, or with a stain on the floor mat, for instance.