The Flesh Tearers are not of Baal origin. Their home planet is Cretacia.
Let's get to his statline- WS6 T4 W4 I5 A4 and a 3+ 4++ save. While ferocious instincts is of limited use, the Whirlwind of Gore is a nice choice to have against vehicles and tough to hurt characters for a more modest point cost of 160 versus 250+ for some of the other big stick named characters.
Mmm, I really didn't want to talk about Seth, but I suppose if I make an all-inclusive list I have to, don't I? I've never really liked Seth, and this edition didn't change that. Sure, it upped his survivability, as it did with every other character, but other than that he really didn't change much... Sure, his weapon now had a bit more of a bite against vehicles, but he shouldn't be focusing on those.... And to top that off there is still the matter of his Lash Out ability, which states that if an attack directed at him rolls a 1 he gets to strike back... ...Except now you never "direct attacks" at a character, except in a Challenge... So by current wording that ability took a hit as well. What else is there to say? I'm not a fan of this character and I think, for the points, you're better off going with a generic HQ or Tycho.
Is that review short? Yes, but you know what they say if you can't say anything nice about someone...
Seth. Whirlwind got nerfed due to pile-in moves. No, he can’t hurt flyers because he can’t assault them.
Sons of Sanguinius:
This guy has been basically unaffected by the new edition. However he has probably gone up in ranking among the characters in the codex. Strength 8 rending causing instant death to any toughness 4 or less I can see as being kind of a big deal, considering how hard 2+ saves are going to be to bypass. Definitely making people think twice about challenging him and allowing him to worry both characters and vehicles in combat. Still a very solid choice and relatively cheap to boot!
3++ (updated link):
Seth still awful.
BA Devastators: With 6th and vehicles being able to be hit more easily in assault along with challenges, Seth is left looking on the outside until an update. At least he is somewhat unique for a marine character in his powers although not in his statline.