Overall I'm really impressed with Gunheart. It's easy to get caught up in the importance of the cross-play aspect, but the game itself is great fun. It's a solid shooter, which some great mechanics and customization that should keep players engaged for quite some time, at the very least long enough to get their money's worth.
Bottom line, while the art may have seen a drastic change the gameplay largely remains the same. The simplicity in controls allows for focus to remain on one's opponent. That simple style keeps things fun. The stages are constructed well enough that you never feel cheated by the environment, helping to zoom in even more on player vs. player combat.
Killing Floor: Incursion is a pretty solid VR experience. The single player (or co-op) provides a great atmosphere. When it comes to getting the horror aspect to be actually horrific, Tripwire Interactive has done an excellent job. It's really that experience that sells it.