Well, the varied opinions are coming in now....
I remember the first reactions and photos of the Mythos Kenobi weren't all kind either, but after getting it myself and having a good time futzing and taking plenty of photos of it, the figure ended up being my favorite from last year.
From what I'm seeing so far, I'm sold on this Mythos Fett. The photos posted by everyone so far have him looking great and the singular video from SirKames makes up for the clunky presentation from Sideshow. I hope the body isn't too loose on it. As for the "accuracy" of the gear and helmet, considering how often the look shifted in the movies, I'm not too bothered by that as long as it looks good. One thing that is readily apparent about this figure...it's all about the futzing. Lots of different ways to go, and that's a big part of what makes it so cool.
It's going to be awhile before mine arrives from BBTS so I hope more folks who get it sooner post more shots to ease the wait.