I think Bendis has pretty straightforward dialogue that's relateable and often comedic, especially if not taken too seriously. People tend to get possesive about their favorite characters.
Sometimes he doesn't write super-geniuses to the degree I think he should, but at least he's consistent. For as smart as Tony Stark or Reed Richards were they still did plenty of stupid things in storries that weren't scribed by Bendis.
As much as I like Scott Snyder for his 2009 to 2011 Detective Comics and American vampire I'm glad that his Justice League and events are over. He went a little too far and got a little too out there with Perpetua and the Batmans. His editor could have reigned those storries in a little more.