Blood Dawn is a busy product. It's a mix of traditional fantasy with post-apocalypse, with a sci-fi background for the fantasy elements. It's somewhat confusing, but I actually like it.
The blending of pseudo-arcane elements with a typical Fallout styled post-apocalyptic setting seems difficult, but with the evidence of such forces as the Rooks, it is explained in a manner that does not compromise the setting. Setting-wise, Blood Dawn is typical with fringes of excellence. There is, however, heavy subject matter that may be disturbing or hard on certain players (the major bad-guys faction commits Holocaust style genocide and uses chemical warfare).
Blood Dawn's d20 based system is very comprehensive, and is superior to the d20 OGL system. It is quite well written, and I enjoyed it a lot.
Blood Dawn is a transfusion of fantasy into a post-apocalyptic setting, and I'd recommend it to anyone who wants a solid setting (it would not be too far of a stretch to compare it to Fallout).