I've only picked up a handful of series 1, but here's my initial thoughts:
The Good:Zartan: awesome take on the character, and as a low-involvement customizer I always welcome the extra heads. The double holster for throwing knives is cool.
GI Joe Trooper: He looks like a very familiar video game character, but that's a big plus for me. And the extra head is a fairly unique, or at least rarely used, head sculpt, which lets me create new characters.
The Bad:Snake Eyes w/ Ninja Speed Cycle: I bought this mainly for the bike, which is okay, but I cannot forgive the permanent hand positions of the figure.
The Ugly:Roadblock: Big, big, BIG disappointment. I've been looking forward to adding The Rock to my collection for the past year, but I can't do much with him because he has a gun permanently attached to his hand! And it's on a unique peg size, so I can't swap it with the empty hand of another character. This design, with objects fixed into hands, is a fundamental violation of the GI Joe design principle, and is unforgivable.
