I have to completely agree. I was so disgusted with the new GW rules, and Darwin's World just kicks complete ass. The only thing I plan to use from the new GW is the equipment and the classic GW critters all in nice D20 Modern format.
Darwin's World has everything going for it except it's campaign flavor, IMHO. That is just my take on it since I like things a bit more wahoo. I never played GW as silly, but somehow straddle the fence between wahoo and Mad Max. Our groups never had trouble being serious, deadly and gritty, but allowing for the genetic freaks, talking animals and plants, etc. It just wasn't an "either or" situation for us. I also have years of GW campaign stuff and the GW factions that I much prefer over the "Twisted Earth".
I'm just using all the superior DW mechanics and classes (I'm so glad DW hardcover is rolling out now), and converting my old campaign stuff to work with them. I'm using DW classes, but GW "flavor". For example, I was working up some high-level Radioactivist NPCs from my GW stuff, and they were "Brotherhood of Radiation" guys in DW mechanics.
The only thing really unresolved is mutant animals. I dislike moreaus, so I'm trying to homebrew some animal rules. I see the difficulty in keeping things relatively balanced with them though, so it is still a work in progress. I'm not a "balance freak", but I want something a *little* less over the top power-wise than the animals from 4th Ed Gamma World. Also, there are no DW factions for mutated animals, so those factions and their advanced classes would have to be created too.
I worked up a *tiny* netbook for Darwin's World, but it will be growing. Right now it's version 1.0, and I have that on the first page of the PDF for anyone who checks back later to see if there are new additions. I hope to add some more content over the holiday weekend (converting some critters from various sources), plus some art from a friend of mine.
Right now, the netbook just contains some GW 4th edition mutations, defects, and neural feats that I converted to DW. This means they are toned-down a little bit. I'm trying to bring as much GW to DW as possible without completely breaking things

It also contains a couple of new prestige classes.
The netbook is written completely in DW-ese, though, so I use "Brotherhood of Radiation" instead of "Radioactivists". I figured it would help support DW with directly-usable, free, fan material. Plus since I'm just mentally and verbally converting everything else in DW to GW terminology, I could convert my netbook stuff on the fly too when I use it.
The direct link to my little netbook is at
http://www.falconx.com/gammaworld/software/DarwinNetbook1.pdf
I have a few DW resources (Random generators, random mutant character starter) at
http://www.falconx.com/gammaworld/darwinmain.html
Any feedback on any of my DW stuff would be most appreciated.
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Tormentor
Tormentor's Virtual Wasteland at
http://www.gammaworld.us