I keep reserving with Hertz because of rates - but there has always been issues with the condition of the vehicles and getting the reserved class with correct transmission. Management is quite sleazy and rude.
I rented a vehicle with them recently, and after I was ready to drive out the lot, I noticed it was standard. The attendants claimed they didn't have another car...but wait they were cleaning an automatic car, never mind it had mechanical problems. The car would not start. It took the attendant a good five minutes to turn on the car and they expected me to take the car.
The manager said take it or leave it. Well, I left it... and ended up with AVIS. Yes, paid just a little more, but got a brand new car in a higher class. I would recommend Avis.
If you are planning to travel outside of the city, please make sure the tires are in good condition. The last car two tires that even the "security warning" was worn through.