This thread is a lot of fun. ttosh is right .... it's all in the fingers. If your fingers turn down the midrange on your amp there is a very good chance it well not cut.
Just about any amp including Marshall's well have a hard time cutting if you deal with a other guitar player (midrange heavy), keyboards, horns also in the mix. Anyone who has played in a larger funk or R&B band knows what I am talking about.
It is all about fitting in with the other things in the mix, settings on the amp, and how the person does the actual mix at the board. Any of this can cause a problem.
Some amps well cause more problems than others ..... several are mentioned above.
I guess this is why I use two amps most of the time. One with the big huge modern bass and the other being a more vintage sound that cuts in the upper midrange running in parallel.