I can't say I've encountered a volunteer department that I would describe as "clownshoes" around here, although I'm sure they're out there.
I ran with two different departments (home & work) - and while they certainly had differences, both took training fairly seriously. One evening a week was dedicated to training and there were other events available on a regular basis in addition to classes held at state and county level training centers that they would pay for.
Classes and certifications will vary a little on a state-to-state basis, but there's some common ground. The basic firefighter classes were about 160 hours, then hazmat awareness and ops classes, plus first aid, CPR and AED certification and you were ready for the FF1 certification test. I never completed the test - I registered, but they were 1 person short, so they cancelled - and I never got around to rescheduling at another facility for a variety of reasons (schedule conflicts, full enrollment, etc). Also did water rescue awareness & ops, vehicle rescue awareness, ops & technician (that was fun
) and a bunch of other classes. There's a pretty broad range of skill sets you can train for...
I'm no longer running due to changing jobs, a busier work schedule, and a back injury (not FF related) that I felt could make me a liability. Overall, I enjoyed my time spent as a volunteer. It's an interesting mix of experiences and it requires a certain level of mental and physical toughness (although the latter is, ummm, sometimes lacking). There is an adrenaline rush at times and you may have to face some of your fears - it's certainly not for everyone. I also remember how much it sucks to wake up at 01:30 to go put on sweat soaked gear (from training last night) to respond to the local old people's home for a malfunctioning smoke detector or burnt food.
Best advice is, like others said, check out the company, talk to people and form your impressions. If you don't have any major reservations, give it a shot.