It's clear that Plague and Light are on a similar level, with Ice not far behind, and flights like Wind and Arcane are towards the lower end, but it's really hard to place most of them.

I'd like to see a much broader spread, though, I agree. It's only really fun to go up against a flight that you are close enough in strength to (Arcane vs Plague would be a pointless waste of time and money for the former and a cakewalk for the latter), but the reputations of certain flights as being "the dom flights" further concentrates people interested in dom there and polarises things more. I'm all for more flights being competitive with the big three.