I can give you some of my favourite list at least
The Serious Sam VR games - the full SS experience with lot's of movement options, cross multiplayer and coop. Huge fun.
Serious Sam VR: The Last Hope - the wave based shooting gallery game. Fun for short bursts and they constantly add content and weapons to it.
Arizona Sunshine - it has a short but neat campaign, looks quite good and really has that scavenging, surviving feel. Also the last content update was really good.
Rec Room - Multiplayer fun with a "MMO feel" to it - minigames ala paintball and so on. Really well done, free too.
Job Simulator - a no brainer, the interactivity is just great.
Soundboxing - Create your workout to music videos, do challanges created by others.
Raw Data - high production values and great shooting mechanics, you need a good PC though.
Obduction - the VR implementation is not perfect yet, maybe wait for a few patches. Otherwise it's a cool "VR Myst" experience.
The Solus Project - same as Obduction. SciFi, light survival game.
Keep Talking and Nobody Explodes - self explanatory
Elite Dangerous, Dirt Rally, Project Cars - if you play those games already check the VR mode out for sure. If not they are worth a look with a sale.
DOOM 3 BFG - there is a VR mod for that one if you can stomach it
Vanishing Realms is getting lot's of good reviews but I have not tried it yet.
There are other small games that are worth checking out, especially horror games like A Chair in a Room. Games like Fruit Ninja VR are very polished and worrth grabbing. Most of those are overpriced a little bit IMO so look out for sales