If you start setting bars, they will be manipulated for political gain, and that destroys the democratic process. Yes, it's annoying that not everyone is informed- but many who are 'informed' are rather much misinformed, and given that a vote in an election is based on a prediction or belief of what a particular person will do when they get into office- whether they will or won't, or even can- even being informed doesn't mean a whole lot in the end.
Better to keep participation open and deal with the consequences; if the situation becomes egregious, the people will express it with their votes, i.e. packing every legislative body across the country with conservatives of all types after Obama whined about 'obstruction' (also known as checks and balances working as intended) and proclaimed that he'd start using executive orders to enact his 'policies'.
So just having voters that always vote straight D or R no matter what because they have absolutely no clue what they are voting on is just fine?
These same people would vote yes for their "party" if something like - " Local Amendment 1 - Implement plan to reduce poverty" was on the ballot and the real text of the amendment was - "Kill all those under a certain income level and use their bodies to build a dam."
Makes no sense.
If there is no bar set, the whole process goes down the drain.