I wonder if there is a significant difference in the drivers who choose Car2Go. The first time I saw a Car2Go vehicle was in Portland, when I had to react because the driver did something foolish. I remember doing a double take to see if someone was training a new driver, and being surprised to see the carshare logo and a middle-aged driver behind the wheel. I figured it was a one-off... until a week later when I had a similar experience with a different Car2Go vehicle... and then a couple weeks later with a third.
I can't recall ever having an issue with other car share drivers, but I pay extra attention whenever I spot a Car2Go and make sure to give them a wide berth.
As a Car2Go user I can tell you that the Smart Fortwo has weird controls and weird handling, which I think makes it a bit ill-suited as a carshare vehicle.
One prominent example is that the Fortwo is the only street-legal vehicle I've driven with a brake pedal that hinges at the bottom instead of at the top. I find this incredibly awkward and it often results in my hitting the brake harder than I intended.
I can't recall ever having an issue with other car share drivers, but I pay extra attention whenever I spot a Car2Go and make sure to give them a wide berth.