The one thing that concerns me about the Leaf is that (as far as I know) there's no advanced thermal management for the battery as on more expensive EVs like Teslas. I guess if you live in a moderate climate area that wouldn't be much of an issue, but I remember reading about people in the sunbelt getting their range cut in half in a pretty short period of time.
And reliability/safety. Leasing should be fine, but the prospect of owning a car whose battery pack has more seals and ancillary parts than the rest of the car combined is off putting to me.