That's actually a pretty solid month for PS Plus Extra and Premium. Avatar: Frontiers of Pandora is probably the biggest name in the lineup, but I'm also curious about Rise of the Ronin and Citizen Sleeper 2. The nice thing about the Game Catalog is that it gives you an excuse to try games you probably wouldn't buy at full price.
Dying Light is another interesting addition, especially for anyone who missed it the first time around. I'd probably start with Avatar and then work through some of the smaller titles afterward. Nine additions is enough that there should be something for most people, even if not every game is going to appeal to everyone.
The catalog has been getting more interesting lately, although I still think the real question is how long these games remain available.