One of the most impressive things about AH, to me, is what you get per megabyte of download - far more than any other game out there that I've seen.
Whilst I'm a bit of a "realism nut" and I'd love photorealistic visuals, all I NEED are visuals sufficient to make my subconscious suspend disbelief about the reality of what I'm seeing. I'd rather extra megabytes go into new planes, or improved strat - or forests GVs can hide in - than in unecessarily fine-meshed terrain or other purely visual frippery. This is where HTC has gotten things so right with AH - just the right level of visual detail so that it looks as good as it works and doesnt involve overlarge downloads.
Gameplay matters more than pretty visuals - WB2 2D is a shining example of this. Looks very poor by todays standards, but plays well enough to be immersive. AH works visually well enough that it seldom jars on the eye, and so the mind sees a world it can treat credibly. More thn that ay be nice, but isnt necessary at all.
Esme