I don't have much to add to what has already been said, but here's my 2c. Give the lubitel a fair go, and when you move up to a smoother camera it will feel like a luxury car. My first MF camera was a beater TLR, with a crummy shutter and fogged lenses, but I learned to make the most of it and became that much better once I had a decent camera in my hands.
Anyway, don't discount TLR with triplet lenses (like the cheaper seagulls, yashicas, rolleicords, etc). I've used a 3 element seagull and a 3 element rolleicord with extremely sharp results. Your mileage may vary, of course.