ViperDarkhaunter said:
I'm getting the sense that the D20 Gamma World and/or Darwin's World settings are not very popular, but could be wrong. I've got some of the books and they look like a lot of fun. Has anyone played these systems?
Well first of all, Darwin's World 2 is where the action is. A very solid product. The original Darwin's World isn't as good as the sequel (which is fully D20 Modern compatible, by the way).
D20 Gamma World? The consensus is that D20 Gamma World is dreadful. There are a few die-hard "I'll buy anything that Sword & Sorcery puts out" people who claim to enjoy it, but honestly, the books are of such poor quality in both production values, editing, and mechanics, that I suspect they were designed by people who have a secret grudge against Sword & Sorcery and were trying to torpedo the studio. It was a conspiracy. It's that bad.
Check out RPG.net for some very detailed and scathing reviews of the dreadful Gamma World d20 Player's Handbook. Yech.
So between the two you mentioned, Darwin's World 2 is the obvious winner, hands down. Gamma World d20 is an abomination.
HOWEVER, if you *really* want to make a good move, I would advise you to pick up D20 Modern and D20 Future and just run the "Wastelands" setting in D20 Future. When Wizards of the Coast saw how embarassingly bad the D20 Gamma World was, they obviously decided to give a nod to a *proper* rendition of the setting. Enter "Wastelands." D20 Future also has detailed rules for radiation, nanotech, robots, mutations, mecha, genetic engineering, and tons of high-tech equipment. D20 Modern has psionics and uplifted animals as player characters.
In other words, now that D20 Future is out, it's really all a true Gamma World fan needs.