His Astonishing X-Men run was pretty awesome, I’m just not high on him as a film maker.
I disagree there. To make sure Hawkeye had good screentime, Joss wrote him in as a baddy (which the character started out as anyway), so each Avenger shined. Not as brightly as IM or Hulk, but they each had some solid moments. Singer doesn't do that. Instead, he throws random muntants in to namedrop, only to have them die meaningless deaths. Even you have to admit that DoFP was a little too overstuffed with what should've been more important characters but instead were fodder.
I actually agree with both of these posts. I think Whedon is a better "fanboy" director. He knows how to throw bones to fans even for characters he isn't particularly fond of. Its obvious that he doesn't care much for Hawkeye, Cap, or Thor but he still gave them memorable moments on film. I still wouldn't say that he's anywhere near the filmmaker Singer is. However Singer is a bit like Nolan where I think he's a little too big for his britches when it comes to presenting a lot of the characters in a satisfying manner. Sure he can craft a decent film, but is he going to go out of his way to do justice to your favorite character? Probably not. Hell he barely seems to know what to do with Wolverine.