As much shit as I give Bendis (all of which he deserves), he writes Ultimate Peter and MJ better - and, hell, MORE MATURE - than anyone outside of JMS has written them in 616 for the past DECADE.
He was also, notably, the only Marvel person who, in interviews, basically said, "It sucks that OMD split up Peter and MJ, because THEY BELONG TOGETHER." If it had been anybody BUT Bendis, I'm sure Quesada would have FIRED him, but as it stands, I suspect this is part of the reason why Quesada hasn't tried to boost sales on NuSpidey by bringing Bendis into the "brain trust."