I like high contrast, good palettes, lighting that fits the mood, and ambient audio that fits the mood. Many years late, I got a chance to play Persona (non-PC, fine), and Nightmare 3D level graphics, and a UI that older RPGs could best easily, it was one of the most immersive games I'd played up to that time. Likewise, the first FEAR was something special, in that regard, as was Morrowind, modded with ambient audio pack mods. Ruins and tombs in that game can still raise my heart rate. All 2D. Give me time, and I could come up with more.
Usable 3D is still too far away to be concerned with, IMO, as a consumer. Plus, I hate contacts. My eyes will probably be stable enough to justify surgery in ~10 years or so, but until then, no. Plus, most games suck at immersion with 2D, despite lighting and sound not being new technologies, any more than stereoscopy. 3D doesn't solve any problem I want solved, but uses resources and time of smart people to fix them. To me, stereoscopic 3D is like the chase for photo-realistic graphics: a technical problem created by lack of creative effort and direction.