rm2k games I have played were really good because in order to make a game worth looking at, people had to know rm2k inside and out to be creative, like the FInal Tantasy fan game made by a bunch of french people (search for it, you'll find it, its AMAZING)
I have yet to see a completed rmxp game though.
Bottom line, I do not prejudge a game based on its creation system. AS far as I am concerned, if its done well the player should not be able to tell what system it was made on though.