Let's be clear about what we mean by "bolt-on" neck. There's the type of bolt on that we see in our Telecasters (neck plate on back, screws coming into the back of the neck). Some acoustics have such a neck (e.g. some Epiphones from the 1970s). I've played a few of them and thought they were fine (I wouldn't reject a guitar because of it). If you can find an Epiphone Bard for cheap, get it!
Then there the mortise-and-tenon bolt-on neck, like you can see in this pic:
This style of bolt-on is a different take on the dovetail joint. I can't really judge the differences between these two styles (dovetail & mortise-and-tenon bolt-on), but I've probably played both in stores and not known it.
One thing I do know: I have a set-neck electric that developed a loose neck joint, and it basically ruined the guitar (fixing it would cost way more that I bought it for). The idea of a bolt-on neck doesn't scare me. Like anything, I'm sure there are good ones and bad ones.