I think people are "afraid" because they forget that Marty came in and took over Trestmans offense. People should hold off on the "he sucks" talk until he is given a chance to come in and formulate his own schemes and his brand of offense. Then they can critique him. Just my opinion.
name one winning team he has coached
He's a coordinator. Coordinators aren't and shouldn't be judged based on W/L record, since that's obviously extremely flawed. Just a horrific way to look at a position coach or a coordinator. Plus, if you wanted to be technical about it, he was a coach on the Eagles from 2003-2012, including roles as Assistant HC and OC. There's four division titles, 6 playoff appearances, 3 conference championship games and 1 SB appearance during that timeframe. Would certainly qualify as "winning".
other than what he and andy reid did he has not proved to have a winning playbook an he will most likely be working somewhere else this time next year if he don't find a way to run the ball and win and fyi that was mostly his offense playbook last year not all trestmen after he took over