i've always liked it when dnb djs introduce some cutting and scratching, and personally have never been a fan of having the MC go on and on, because then no one pays attention to what the dj is doing (or not doing).

there are lots of crap djs in other genres...certainly techno is not immune. but i think the music in some other genres is specifically built to make mixing quite easy. that's fine as long as you venture to more interesting stuff!