The agent tried to get me to pay more for a car I didn't need.

Picking up the car from Fox wasn't hard, there's a shuttle from the airport. Our car had a lot of dings & scratches, but that's not a big deal, it worked just fine. HOWEVER, returning the car was infuriating. They are not located near the other rental car drop-offs, so following signs at the airport for "Rental Car Return" is an exercise in futility (it would have been nice for the staff at Fox to let us know returning the car wasn't sign-posted). We finally found them with out GPS, and while they advertise being open 24 hours, that's only sort of true. We arrived and it took 20 minutes to find a staff person. I finally found someone we could check the car back in with and had to tell other poor customers wandering aimlessly where he was. The car return experience was frustrating.

The car had plenty of room but the service was the worst I have ever experienced. The management at the denver location could have cared less about any issues with my rental. She even walked away from me while I was talking.

I waited over an hour for a customer service agent. This has never happened in my life at a car rental agency. Once I got to customer service it was very fast, the agent was very courteous, professional, and efficient. He was one of 4-5 other agents, but the other agents seemed to take much longer. This appeared to be part of the extreme wait time. I also did not get the car I wanted. I reserved a 4-door sedan, but got an SUV. I was so tired and hot (it was 90 degrees in Denver) from waiting that I didn't even ask for a different car, I just wanted to get out and leave. Drop off was much faster, but I noticed that the line for others to get their cars in the morning, was just as long as it was for me in the afternoon when picking up the car. The shuttle to the airport was ready and waiting.

The car was not full tank, everything else was okay

Did not get the vehicle that I wanted. Took a long time waiting and finishing process at the counter.