don't we normally do score sheets? 1-5 or 1-10 for gameplay, balance, aesthetics and something else... theme?
As far as i'm aware there's only like 5 or 6 entries unless someone pulls a map out there arse (which i can't imagine would play well, and will probably smell), so doing some write ups and multiple ratings shouldn't be too taxing. I'm not quite sure how you'd do the second or third options... and a single vote doesn't really represent how you feel about an entry. I'd like to vote for the map that plays the best but then that could just be an alpha someone hasn't developed past 4 weeks whilst everyone else has developed their gameplay and run an artpass for months. They really deserve just as much credit, especially if it looks amazing.