Not quite sure if it's been suggested before, since I don't know what exactly to forum search, however...
Noticing the Recommended Games to the left with the new hub update, I was wondering if we could have (or if there already is) a list where users are able to add games that they don't want their key to ever visit or even show up on the hub for them.
Such as example:

This_Game_Name by This_Game_Maker.
[Forum] [Share] [Favorite] [Ignore]* [Watch]

*The ability of Ignoring would be that whenever you are logged into the key with the game Ignored, the game never appears to the key user. Almost like the game never even existed.