I enjoy them as long as they're genuine polls/questions, and make sense. Really hate the ones where people are like:
Cookie Underwaer Your MOM!!
There's also an artist I won't name, who makes about 5 polls a week, and every poll for the last several months has been solely about their made-up world/race. Kinda feels a little conceited, and unless you're one of their die-hard fans, it gets pretty redundant. And meaningless.
I like them on the condition that I don't get more than one or two a day, preferably a few every now and then, not a constantly stream. Case in point: I replied to this one, but yesterday someone sent 11 polls. All were deleted.