I think everyone realises that the Zenit cameras are bargain basement, old school heavy chunks of metal, but what has that to do with basic photographic potential? The metering, with two LEDs in the viewfinder, is very accurate. The shutter speed, albeit limited, are accurate.
I used mine for many years, it beat the hell out of my other Praktica cameras in terms of reliabilty and quality of images with the Helios 28m, 58mm and 135mm lenses. I went over to Minolta when sold my Praktica set, and the Zenit still beat these AF,AE, digital era 35mm SLRs in su zero temperatures, when their lithium batteries froze. Still unsure whether the Sigma lenses I have with the Minoltas can match the old Helios lenses for definition and depth!