I must agree. I know this sounds silly but the thumbs up/down system is so... mainstream. The scales, however, seem to fit the game more. If it were me I'd rather see something more within the game's theme. I'd understand the scales, but I get they might not be as clear.
Buttons seem OK, but what about levers, suiting the style of steampunk-ish airships and such? Red/green, shouldn't be that hard to miss methinks.