Totally disagree.
Imagine how bad it would be to verdicted (ha- it should be a word!) by a jury of your peers, who didn't bother to pay attention at the trail.
Think about all those utter **** who commit very complex fraud, often involving structured products which require good knowledge of stochastic calculus, been judged by 12 people, only 1 of which has even maths A-level. A lot of people have gotten clean away with this, I know 10th hand folk stories about far too many for them all to be un-founded (also it is seemingly temptingly easy)
No, an ignorant vote is quite worrying. I'm all in favour for people having a none-of-the-above option, dignifying spoiling ones ballot paper.