A lot of commenters on this thread have mentioned the high depreciation of the Volt. However it must be tempered with two very important facts: 1.) A lot don't seem to take into account the various tax credits and rebates when calculating depreciation. When one does this, the depreciation is comparable to most other cars. 2.) The Gen 2 Volt came out two years ago. It is a big improvement in almost every way. (Yeah, no Homelink. But if it is important, it is a trivially easy DIY add-on.) Consequently the value of Gen 1 Volts have dropped a lot. Again, this is no different than other car lines that have moved to a next generation platform.
Our 2016 Volt rolled 28k miles a few days ago. All but around 400 have been pure EV. And much of that 400 was forced due to Fuel Maintenance Mode. Consequently, I've been going 'i3 REx style' - keeping about 3 gallons of gas in the tank. The car has only been back to the dealer for tire rotations and software updates/recalls.
If someone is looking for a bridge until their Model 3 arrives, a used Volt can be a great 'starter kit'.