For me it is. Where I live there are multiple EV car-sharing services so I got to try them all: between the i3, the leaf and the renault zoe the i3 is by far the nicest to drive and most fun to be in, in my experience. Zoe is also nicer than the leaf, though underpowered.
I'm really into the i3's interior though: the steering wheel and the screen just look like they're floating and the dashboard looks so sleek.
In Copenhagen we have: letsgo.dk, gomore.dk, drive-now.dk (the latter also exists around Europe). I've never used Gomore though; it's the other two how I got to try the cars.
edit: I should mention that gomore isn't EV exclusive, drive now is EV exclusive here though.
I'm really into the i3's interior though: the steering wheel and the screen just look like they're floating and the dashboard looks so sleek.