Five fingers to close app on iPad is also way less sensitive than before. I have to do the gesture multiple times to close apps. I don't recall having this problem on older iPads and iOS versions. I don't know if it's related to hardware or software though as the iPad came with iOS 9. Already filed a bug report.
IMHO this is a result of having the touch routines do too much now - now they have to account for pressure too (3D touch) and it's very possible that the routines are the same even for devices that do not support 3D Touch. The underlying software needs to distinguish between tap, hold, press, slide, slide over edges and on top of that do an accidental touch rejection near the borders. Too much margin for error.
All around gestures seems a bit wonky - either overly sensitive, confused, or insensitive. In all, a pita.