I think what everyone is trying to say is how can a preset possibly know what you want to achieve and what your input signals are like.
So while the preset may have a fast attack, 4:1 ratio and slow release because that happened to work on the preset designers sound within the context of what was in his mind at the time, how can he or anyone else know that that is the sound you like or are looking for. If it happens to work for you then great, the developer happened to stick a pin in a random collection of variables that happen to work on your current mix
Even on distorted guitar, which by the very nature of distortion is already pretty compressed, there are a lot of variables. Does the attack need to punch through the mix or sit back and behave behind other stuff, Are you after a lot of sustain or does the guitar need to make it's point and get out of the way quickly, is the playing style fast and choopppy or slow and smooth and so on.
Even if you set up the compressor to get your distorted guitar exactly perfect for one song, who knows if that would be an appropriate sound for the next song you are working on
you might as well call the preset 1 - 20 for all the good it will do you
REAPER's compressor is pretty good and can get you what you want, you just have to know what it is you want