Two Reasons I never tried MB
1) I didn't know of Planeshift existence in that time.
2) Unreal 1, Unreal Tournament, Soldier of Fortune 1 and 2, System Shock 2, Deus Ex, Civilization III, Neverwinter Nights, Planescape Torment, Fallout 2(not necessarily on this order) among others occupied most of my time as a gamer thus I did not have the interest of searching for free games(except for one called Vegastrike that I discovered when I installed a Linux distro for the first time, because it had a installation script for it, the first OpenSource game I played

), anyway all of them were certainly more fun for me and if I knew MB I would certainly dismiss it as I would prefer Tetris or dominoes than hunting crystals and running around in circles.
