Yeah, not only does my cursive suck, but I'm left-handed and so when I handwrite I drag my hand across what I just wrote. (Doesn't happen when I print)
Needless to say, that box on the LSAT ended up looking like one big grey smudge, like I had used my answer sheet as a filter for a coal-burning stove or something. Plus, my hand started marking up the rest of the answer sheet when I was doing the actual test, meaning I had to keep erasing and it looked awful when I turned it in. Sheer misery.