DCS World is an amazing experience in VR. Given it is free and includes a free P51 Mustang trainer and Su25T Russian attack jet that are both fully modeled, there is no excuse not to try it. Oculus native support and a pixel density slider coming at the weeks end illustrates the commitment DCS has to VR.
I haven't tried War Thunder in VR but will and expect it will look great. Having flown everything pretty much worth flying since SubLogic first wrote Flightsim back in 1975, I have to say that if you really want to feel what it is like to be in a WW2 aircraft then ---DCS
Although Project Cars is surely fun when it comes to driving, IRacing it the pinnacle. With native Oculus support , as well as, a new DX11 engine this drive is as smooth as a babies bottom. The sense of depth to the corner is sublime. My racing lines have improved dramatically in VR. What a rush.
I too am disappointed with Vorpx. I do enjoy Skyrim, Portal, Black Mesa and Half-Life 2, so I guess I'll live with the purchase, but the program isn't high on my recommend list.
Adrift is quite good and gorgeous to look at. EVE Valkyrie is pretty but after so much time in all that is Elite, it just doesn't do anything for me.
I tried both DCS and warthunder and prefer warthunder.
I found DCS not as well optimized as warthunder. You really need a powerful PC. I have i5 and strix GTX970 which shows very much stuttering. Warthunder on the other hand much mcuh smoother. Also DCS not enough online players(compared to warthunder) and found that even though it suppose to be more true sim, you can fly thru trees and buildings as if they are not there.- what's up with that? Needless to say I unsunstalled it.