Depends. Remember a lot of this stuff is driven by small dev houses and in some cases - one man bands. Sometimes the graphics aren't up to scratch.

Also - there's a tendency towards flat shading as an aesthetic choice - it actually looks great in VR and frame rate is king.

However - check out something like Valve's "The Lab" to see how skilled devs can produce stunning graphics that run really smoothly in VR. It shows it's possible...