If you avoid Nvidia, it have been ready for many years. And to be honset, not sure X11 was really stable with Nvidia either. My main issue with Wayland, is that X doesn't have multi dpi support... and for that I really cannot blame Wayland. Also, Skype doesn't have screensharing, well, they actually had for a while, but then removed it... still, hard to blame on Wayland.
But as a general rule, if you have Nvidia, then you are not allowed to complain about anything... that was your choice, and with Nvidia under Linux, all bets are off. I thought that was clear a long time a go, especially after Linus not so subtle outburst.