for whatever reason, good or bad, there are certain bike brands that i just don't like.  i'm sure the bikes are fine, but there's just something about them that i can't stand. design elements, graphics, component choices, or the kind of people that ride them - any of these things can set me off.
i don't know if i'm alone in this - i don't think i am.  i'm sure there are people that just hate certain bands, or clothing lines, or whatever - but can't really say why.  or at least can't give a particularly logical reason anyway.
if you've gone through the archives here at all, you probably have a pretty good idea of which bikes i don't like already.  but here's the weird thing; things change!  i never liked GTs much at all - i thought the 'triple-triangle' was gimmicky, and the paint jobs were garish.  but now, if you can find one a clean one from the 90's - i'm tempted to buy one myself.
like this 1991 Avalanche;
save the tires (and maybe that fork), this bike is completely original.  it's amazing!
i wish i could say why i've softened my stance on GT, but i really don't know why.  maybe it's actually those old Shimano XT parts i like?  maybe it's that Rock Shox Mag21 that was so revolutionary that i like?
or maybe it's this;
this is zzzomm's 1990 GT Tequesta.  in the fall of 1990 he and i bought bikes.  i got a Bridgestone MB-5 and he got this GT.  just last summer he reacquired it from a friend, and I got to redo it.  i scored a full XT Raleigh, and moved every part i could onto this GT.  i was really happy with the way it turned out and i really like this bike now.
i still don't like Trek though.