windows update good or bad for gaming

It probably won't have much effect on any gaming, what does have effect on gaming are GPU driver updates. OS updates are very recommended for security reasons, i would keep them enabled if only for that (in fact, i do: i recommend you do too).
 
In theory, it should be neutral, unless they updated dx12 or something.

Either way what I typically do is wait, unless the update is genuinely important for security reasons, until some of the bugs are ironed out (obviously depends on the update. Anniversary = not worth)
 

UPDATES can be bloat and bad... everyone knows that.... i just wanted to know what it does to my gaming lately ... i usually have it turned off