The car rental process at Munich Airport is indeed very busy. Europcar, SIXT, AVIS, and Hertz counters all have long lines. Europcar had five out of seven desks open, which was less than other companies who had all their counters open. However, a positive aspect was their numbered ticket system, so you don't have to stand in line after taking a number; you can browse nearby shops. This time, I waited nearly 40 minutes to get the car. I noticed that foreigners finished their process in just a few minutes; it took me less than ten minutes, but the groups of Chinese people in front of me took significantly longer, especially one group that took over half an hour.

Honest

Booked a Benz Class A but got a general car. They said I could upgrade to BMW for an extra EUR 42 but ended up charging EUR 75, which is double the original price. This company is a scam and garbage. No one assisted when picking up the car, aggressively made me sign saying there was no damage to the car. Terrible attitude, blacklist!

excellent

Like: Clean car, matched the size we had ordered although not the brand. Easy to collect (after the long queue) and drop off at Munich railway station although you need to keep your eyes peeled to find the drop off garage.
Dislike: We queued for nearly an hour at Munich airport to pick up the vehicle even with the ticket system. The ticket machine needs to be more obvious or at least a more obvious sign.