In most cases, a decent CLA will bring many Soviet cameras to a good (even a very good) working order (possible exceptions being late Feds... )

Most 50+ year old cameras will need some kind of work.
Lenses can be very good (more or less 1930's Zeiss or Leica clones), but that also depends on getting a good sample or having what you have properly repaired.

If you want something that works out of the box, there's all kinds of new plastic stuff out there, but it probably won't even be repairable in 20 or so years...