My Bellows Camera of choice is a Kodak Brownie Autographic #2. I don't worry about Film flatness. it leaks like a sieve, although I think I found the problem now. The viewfinder is dim, and lousy and only provides general information, focus is by guess. The shutter and aperture settings are sort of close to right, and I sometimes forget to adjust them before taking a photo. I have two of these cameras. Why do I put up with these things? Some of the best photographs I have ever taken were with these cameras, I don't know if people relax more with the look of them or what, but I tend to get good shots with them.
I say that if you already have a Medium format camera that you can do really quality work with when you want or need to, then get yourself a budget folder and enjoy it, they can be a lot of fun, and attract a lot of attention as well.