Gail Simone: I "get" where she is going, but she is *dragging* her ass getting there... as a 30+ year fan of Wonder Woman, I am disappointed that WW's first female full-time writer has the skills, but not the implementation, to make things work...
And yes, there is more to Diana killing Ares than meets the eye (he's already showed back up in her bedroom just an issue ago, and you can tell that much of this is part of a bigger plan on his/others' parts)...
But back on Topic: DC Ares vs. Thor is interesting, to say the least, and in general much better matched than the Thor fanbois realize. Circumstance would have a lot to do with who would win (if planning and finesse were involved, then Ares; if it's a sudden, all-out battle to the death, then Thor -- but only marginally, and after a good deal of back and forth. But Thor in that latter case, never-the-less...)