The 2015 Mercedes C Class is a decent vehicle, although I would take a BMW 328i over it any day. I recently had a 2015 Mercedes C220 BlueTec from Sixt in Spain and I was dismayed at the column shifting as well as the lack of cup holders on the particular model I had.
For some reason, I have never received a rental vehicle of a European marque that has had a backup camera. This includes an: Audi A4, Audi A6, BMW 328i, BMW 330d Touring, Mercedes C220, and a Volvo V70 D4.
Actually, the Volkswagen Jettas that Hertz has always have backup cameras it seems.