I find that much of what I desire is cosmetic in nature (hangs head in shame) and, of course, smooth play without CTDs.
Cosmetically, I want realistic uniforms, accurate interiors, more interior, immersive environment (ocean, etc), realistic sounds, voices and lots of ship types that look accurate.
A challenging game is always welcome, of course. But if GFO offers me a really good looking and sounding version of vanilla of course I will promote it as much as any other mod I enjoy. Maybe more so to new players.