Waited in line for three hours

Everything was satisfactory except I didn't get the model I booked.

1. Low efficiency, the queue time was extremely long. It took me over an hour when there were only five or six customers ahead of me; 2. They added over 500 euros in extra charges to the contract without informing me when I picked up the car. Fortunately, I spotted it and refused to pay; 3. The pick-up point is a ten-minute walk from the counter. The car was not filled up with fuel. After a long flight and long queue, I was too exhausted to argue, so I just accepted it; 4. At drop-off, they tried to charge an extra 460 euros. They handed me a 4-inch screen device to sign. I spotted it again and refused; 5. Everything was fine when I returned the car, but they still tried to scam me into buying personal and car insurance. This is just ridiculous; 6. Finally, they directly charged an extra 460 euros from my credit card without any signature or authorization, despite my two refusals. This is outrageous! Currently disputing the charge with the rental company and card issuer. 7. In all my car rental experiences across North America, Latin America, Africa, Europe, and Southeast Asia, Budget at Frankfurt Airport is by far the worst!

Average experience, nothing special to mention

The queue was very long and the efficiency was extremely low. There were only 5 people ahead of me, but it took an hour. Super slow!