I dislike rap because it's mindlessly repetitive. Spoken vocals that don't even require pitch changes over computer-manufactured drum beats and sampling.
I could say this, but it would bely the amount of industrial I listen to. One could make these criticisms about Laibach, but somehow I love Laibach. It has to do, more in my mind, with the use these kind of things are put to. An american dude in trainers rapping over funky beats doesn't cut it for me, but a gravelly-voiced slovenian pretty much speaking over heavy as fuck 909 loops, simple guitar and sample choirs and military marches somehow works perfectly, even though you could never claim that it is less repetitive, less cliche, whatever.
It all comes down to dancing, I think. Hip hop is, after all, pretty much dance music, and if I can't stomp, mosh, headbang or gothdance (tm) to something, I'd rather not hit the floor. Others of course would prefer to sit it out, no matter how many times Milan says "KOMERADE, KOMM TANZ MIT MIR!"