Well, I'm not as diehard a Marvel fan as I am a DC one so I might be a little off here, but.....
His older street level stuff people liked back in the day and still enjoy; Daredevil, Ultimate Spider-Man, Jessica Jones......
But he doesn't seem to do very well with high concept properties. I think the hate for him really started when he took over the Avengers and did this whole thing with Norman Osborn running the group like a more publicity-friendly Suicide Squad. And then he spent a few years on the X-books and brought the original roster, still as teenagers, into the present day.
I think the problem with Bendis is sort of like the problem with Johns; they did amazing stuff when they were starting out, but as they rose higher in the company they got free reign to do what they wanted without editorial to rein them in that allowed some bad habits and bad ideas to bleed through, often in excess and with universe-wide ramifications you couldn't easily ignore.
He's the new guy at DC but he's still Bendis, still a big name. Hopefully he treads carefully and we get some great work out of him. He's certainly capable.
I think itd be funny if he ended up in Dark Matter. The line that is largely a DC analogue for a bunch of Marvel properties.