As others have posted a bad recording is just simply, a bad recording.
there is nothing that can be done.
Now, if the recording is mediocre but you have a good resolving gear, then differences can be heard. subtle as it may be, but it can be heard if your gear can resolve it.
I enjoy listening to my gear, especially when I play Vinyl. I have a small set of really good pressings and a lot of old records that i get from record stores on bargain. it is just me, but I listen to these old records as this reminds me of my grownup years but the recording is a hit and miss. So, if I want to hear how this was recorded and just the facts, then I use my clinical sounding speakers (ATC) and if I want a warm British sounding smooth and melodic sound, i switch to my Ls3/5a. and listen how this recording may sound. but again, if the recording sucks, then there is nothing that can be done