I had this exact arguement with my 86yr old grandfather not so long ago.
My personal belief is that it should be compolsary to Poll but there should be a box to tick that says "I choose not to vote"
This way people wouldnt make "donkey votes" which may have an effect on the out come. But would still make sure those with an interest that would other wise be too "lasy" to go to the polls would still cast a meaningful vote.
IMO voting should not be treated as a right - but as a priviledge. Theres plenty of people in this world who would love the chance to vote in a democratic society.
Its too easy to influence certain groups of people to vote even if it is not compulsary...
There should also be an independant information service which if you enter your "criteria" for who you wish to vote for - it will come up with the best voting solution for you...
...doubt that'll happen in a hurry though.
My interest in business/finance pretty much secures my vote - even if I dont agree with all of their policies