Better than voting for who looks the best on TV, or any of the other ways people vote without being fully informed. I'm sometimes forced to leave sections blanks because I cannot find anything about the candidates (I don't know why my state vote on judges, the only way to find out if they any are good is to spend 100% of your time in court rooms, reading decisions, and so on all year)
If you trust them. Where I live the bar chooses the person on the ballot and we only get a up or down. Thus any evaluation they do is by definiton a conflict of interest.
Well, where I am there are fourteen different bar associations. I'm not saying that if they all agree a judge is good it's always so; but if three of them think a judge is not qualified, that's not a judge I'll vote for.