Most of us are probably still hurting from Ben Bishop
Bishop established himself as an excellent goalie in the AHL and had good numbers in the NHL when traded.
Lehner backstopped the B-Sens to the Calder Cup at 19, following excellent numbers in the OHL, and had good success in the NHL before being traded.
They were both significantly better and more promising young goalies than Gustavsson when they were traded.
Gustavsson's numbers look bad in comparison to those two guys, and obviously he doesn't have the same size and athleticism as they do.
I'm not worried about giving him up. Losing Sogaard would have concerned me a lot more.