In terms of conceding 9 goals in two games against mediocre (at best) opposition, it can't be Unsworth.
I think you'll find every manager has had games like that. Unsworth has been put in at the deep end. Taking over someone else's mess, trying to learn about his players when games have come thick and fast, trying to install his own philosophies on a team lacking in confidence, he was on a hiding to nothing. Most managers have better settling in periods. I think it's unfair to criticise too harshly.
It can't be Martinez, Moyes and no one is happy with Sam. Koeman is my first choice out of those names based on reputation, but we saw how that went. Unsworth is the only one who hasn't had the proper chance. In normal circumstances, I think he will make for a decent manager He needs to go out and get that experience.