Hi,
Well, I'm out of rant mode and will say that I must have been lucky with my cameras. FED and Zorki models 1, 2, 3 and 4. And mixed luck with Leicas; some unlucky (St'd, M2 and R5) and some lucky (II, IIIa, CL, C3 etc). And mixed luck with Olympus but in each case I've had around 2 dozen of the things over the years and dropped them and so on. And if I haven't dropped them, someone else may have...
Mostly, these days I see it as luck. The film cameras available are all going to be second-hand and you just don't know what's happened to them. But an overhaul will usually restore all of them to good condition and then I'd say that the FSU ones are no better or worse than the others. Only the M2 feels better in use and the other (hate to say this) are just old cameras taking good pictures with good, bad and plain weird points.
Regards, David