for example some mbritt that sound so distant/covered by a blanket and full of low mids that i can't imagine how they are useful/playable, unless i miss some technique to make them shine (any advice on this point is appreciated).
I agree with you here. Compared to a lot of other profiles the MBritt ones are quite dark and they don't work well (with a few notable exceptions) for me in the studio, BUT, live and in rehersal they kick ass. They have a weight and punch that very few others have. I have profiles from pretty much every commercial profiler there is but I still use my old trusty Britt profiles live.