Sometimes I wonder whether the points offered for car rentals are worth the hassle of getting them properly credited. Things have improved for me over the last year but you have to give your member number at least twice (when you pick and drop off the car) to be guaranteed of a fairly hassle free posting of points.
Hertz and Avis tend to be OK and Budget not far behind. The worst are Alamo and Thrifty (consistently bad)--I can't complain too loudly as some were for $10-15/day rentals. Even for those cheap rentals, the agents did each time fill in my membership number or filled out the appropriate mileage form but I still haven't received my points.
I must say Hertz has been better on average quality wise although I found some of their U.S. locations and vehicles to be substandard to Canadian ones.
AVIS has consistently been good. When they stood me up (only once) at Yellowknife at midnight in the Northwest Territories, they compensated me with $100 in car rental vouchers which I used for an Australian trip.
I have had good luck with some of the "no miles" and no frills cheapo rental outfits like Payless in Europe and U.S, Resort in southwestern U.S. The most hassle free pickups (lack of lineups, car close by) have been with Hertz and Avis, closely followed by Budget.
[This message has been edited by BlondeBomber (edited 03-04-99).]