Arizona Sunshine is a great game made better by its multi-player modes. Co-op campaign and Horde mode (2 players and 4 players respectively) are both functional and a bals with friends. 9/10

Raw Data is a great game and was one of the first kind of "AAA" titles for the Vive. It still has people playing and is great for co-op. Definitely the best experience is co-op. 9/10

Hover Junkers used to be a great title but the servers are dead and there isn't much going on with it. If this review was closer to release it would be postivie but cant recommend currently.

SSVR: The Last Hope is a solid entry in the wave shooter catergory. It suffers from being in early access, but there is lots of new content planned for the future. 8/10 currently!

Elven Assassin is a great multiplayer "defend the castle" type wave shooter. It currently supports 4 players co-op and has great visual with an active development team. Also fairly priced!