Had a very nice ride last night in a hybrid sort of way. Couldn't make up my mind where to go, so I grabbed my flat-bar Fargo and just went wherever. Took the road uphill out of town. Jumped onto an ATV trail for a mile. Then back to road again. Stopped to see some friends. More road. Then some snowmobile trail, which took me to an ATV trail trail, which -- after a long section with knee-high weeds -- dumped me onto railroad grade where I rode the ties between the rails for a bit (bumpy!), and then rode the ballast. Next I jumped onto a dirt road. And from there all the way home I mixed it up between road and ATV trail and snowmobile trail.
Not a ride for a road bike--riding the ties between the rails would probably have damaged one. And the mountain-bike wouldn't have been nearly as much fun on the pavement. The Fargo handled everything reasonably well, though there were a few times I could've wished for a bit more traction in sand than the Big Apple tires are able to give.
So a hybrid ride for a hybrid bike. Seems a good match to me.