Experienced sports journalist Kevin Nolan provides a withering assessment of new Charlton keeper Yohann Thuram-Ulien here: Thuram-Ulien
I haven't seen him play yet, but listening to the commentary from Wigan, I was concerned by his reported tendency to punch out the ball rather than catch it. Sometimes punching out is the only or best option, but he did it rather too often. Someone who was at the match whose judgment I would trust also expressed concerns.
I thought that Ben Alnwick was doing well and his departure bothered me. I have had mixed feelings about Ben Hamer: he is often too hesitant and doesn't command his area enough. However, he may be better than the new recruit. How serious his injury is, I don't know.
There is often a rush to judgment in creating scapegoat players, but there are good grounds for at least some concern.