After reading through that thread it seems as though making the printer do what you want is a full time project. This isn't promising at all... sheesh...
I have not had that experience at all. I have modeled very little myself, but I've downloaded a good hundred or so models off Thingiverse and elsewhere, and printed fifty or sixty things ranging from tiny plastic washers that take three minutes to intricate print-in-place mechanical toys that take hours. Assuming that the model is well-designed (not always the case, and something you'll learn to recognize this better with practice), the Prusa MK3 normally just works: it puts out a good quality print, and it does so consistently, so that the fifth time you print the thing will be just as good as the first time.
I'm running a stock Prusa MK3 as built from the kit delivered to me in June of 2018. SecretSquirrel had concerns about the power supply and the print bed, and chose to make some significant modifications. He's also looking to print some significantly larger, longer-duration prints than I've tried (my longest has been seven hours). I haven't made any such changes, and I couldn't be more pleased with the manufacturing quality of the printer.
I genuinely recommend the MK3 as a printer for people who want to print things, not tweak a printer.