Just usb webcams you say?....
There are only 2 complaints I have with the Win10 update.
1) It changed both my language and system settings to Japanese - Every update that changes version number does this. It's fucking annoying.
2) I cannot watch streaming video, this is not just a webcam issue, it's an H.264 issue. Any site that streams in H.264 is stuffed, it'll buffer and play maybe 10-15 mins worth of video then either just stop completely, or stop for 30 seconds and start again from the beginning of the stream, rinse, repeat.