Room For Debate asks. Jason Brennan is solidly against the idea:
The median voter is incompetent at politics. The citizens who abstain are, on average, even more incompetent. If we force everyone to vote, the electorate will become even more irrational and misinformed. The result: not only will the worse candidate on the ballot get a better shot at winning, but the candidates who make it on the ballot in the first place will be worse.
The Dish covered similar ground recently.
The Dish 