One of the many things I loved from original Gamma World were the Cryptic Alliances, in just a few lines we got a glimpse into some cool (& sometimes twisted) groups to use to mess with our player's characters.
WW#6 Factions allow you to inject a bit of that into your Mutant Future Campaigns. Want some serious Eco-Terrorists! Go with The Gaians! Or maybe you need a bit of a Anthropomorphic slant ...how about the Uplifts! I'd have gone with a 5 star but for the art, course going with better art would drive up the price.
[4 of 5 Stars!]