I shared a house with a wee scots guy who had a mountain bike and would come home muddy each siunday - I never really got it, especaiolly all them gears as I was very much into road riding.
not sure want made me change my mind but i bought a light blue 22 inch (yep, miles too big) Trek 850 (1992 vintage?) in 1/2 price sale .... and never looked back. (never seen another one of these)
after stripping, the frame and forks were sold, the components going onto a 20" green Saracen Kiliflyer frame + fokrs. this was dark green with funky grpahics and internally routed cables, again never seen antohehr one of these.