Yes, it would be wrong to assume that everything on vinyl is going to sound fantastic. I buy a mixture of second hand and new vinyl these days and haven't had a badly warped one for quite a while. I don't buy much from the 80's. In the 80's when vinyl got thinner and thinner it was a case of trying to find an unwarped copy, especially with pop. A well set up deck will cope with a warped record though.

Somtimes when buying second hand from, say, a charity shop, an LP can look ok but crackle like hell throughout. On the other hand an old album can be covered in surface scratches and play perfectly fine. Undetectable deep groove damage caused by a worn or damaged stylus is a pain in the butt.

It's a pity classical music is no longer released on vinyl. Surely there's a market for it?