I know a lot of Joe fans are really miffed by this line, I was among them when we first saw the Sigma 6 line as I've been a RAH fan since forever. However, what drew me to the RAH line is what ultimately just drew me into this new Sigma 6 line: the accessories. RAH was amazing to me because there were a million accessories with every figure, guns, swords, gizmos, you name it, and with Sigma 6, the 4 sets I've bought so far have had even more accessories per figure than even the RAH line! Plus, the 8" scale lets the articulation really work well, and the accessories get to be bigger and more detailed. The minus is that RAH's myriad of vehicles is not feasible with this S6 line, the only vehicle so far is the Ninja Hovercycle.
So far, I have Snake Eyes, Duke, Storm Shadow, and the Ninja Hovercycle. The cycle is a little big for the figures but doable, and it's nifty in its own right AND has lots of accessories (it has SE's accessories but with a few changes). The figures are all very cool, somewhat cartoony but not ridiculous or overly-anime (well, SE's eyes are, but he has the visor that can cover it up), and each figure sports lots of articulation which was the other thing about RAH that appealed to me. RAH was more about building armies though, where at $15 a pop S6 is definitely not going to have dozens of figures in kids hands, so there are trade-offs, but S6 has great play value just as RAH did. The S6 Joes even have flip-up commlinks on their wrists which is a great touch.
SE and Duke do have an oversized accessory, SE has the whip-star which ain't too bad but also the zipline handle which is just too big (and the whip-star's rope isn't long enough to make that fun anyway), Duke has this oversized grappling gun with huge hook and pull-down-to-go-up feature (but it does work with the switchfire gun so that's a slightly saving grace). SS has a display stand for his 2 swords, it's the least offensive of these larger accessories though. All 3 figures have lots of cool accessories to make up for the one not as cool accessory, Storm Shadow's traditional ninja gear being my favorite overall, though Duke's switchfire blasters and 2 of its attachments are really cool too, and Snake Eyes has some good stuff as well.
I saw one ep of the show, for me it could not have been worse, but I loved the old RAH line for years without thinking about the show (I watched the show, but not religiously like some of my friends at the time), so I am pretty sure S6 will work for me based on the toys in spite of the show and that'll be just fine.