I think electric's are mostly superior, when operated for their intended use / within their tolerances; I think the pros of being quiet, efficient, and clean (*pollution is made elsewhere for batteries, charging, etc.) outweigh the drawbacks of shorter range / range anxiety, longer refuel times, cost, and outright performance / reliability.
If you live an urban environment and have a commute where you can make the round trip, or charge while you're at work, I can't think of how a gas motorcycle would be better for that intended use. However, if you like to go touring also, you'll probably want to have a gas motorcycle for that purpose.
Fast charging tends to deplete battery life faster, and over-working an e-bike motor can start to burn out circuitry, which would be expensive fixes. After a while you end up riding around a device that operates sub-optimally (higher current draws, lower battery life). Of course it's possible to burn out gas engines as well by running them past their tolerances, but because they have the reciprocating mass they do a lot more work (although they create and waste more energy as heat in the process).
If you could only have one motorcycle, and want to be able to go on trips / long weekends, it'd have to be a gas engine (in my opinion). But if you primarily ride around town / commute, I'd seriously consider looking at an electric motorcycle for that purpose.
Also, if you have the ability to tow the motorcycle (a trailer or hitch-carrier), I can't imagine a more epic feeling of blasting down a forest service road on an electric Dual-Sport, with only the sound of the wind.
Of course you'll eventually need to charge it.. =/
I think the future of e-vehicles will be 'hot-swappable' power-packs, so you can pull into a "charging station", drop off your spent pack, plug in a fresh one, and off you go while the station charges your old pack for the next customer.
While some might claim there are environmental benefits to electric vehicles, there is no doubt a high environmental (and social) cost associated with the manufacturing and disposal of e-vehicle batteries.