Graphics are not a big part of the experience at all, though it is a part. A small one, though.
Have you seen how people flock all over MineCraft? WoW, too? Graphics aren't close to spectacular, and people love the gameplay(Though with WoW, it's more the leveling and socializing, I think). But these guys cannot lean to do just that: love the gameplay, story ect.
Really, this cannot be argued by them or anybody. But I admit, if anybody is producing anything like an N64 or PS1 quality(graphics, of course) game now-a-days, that would be a bit meh.
But these people complained about something that looks better than most games coming out this year.
"It uses DX9, the world is over. I need to get laid WHAAAAAAAAAAA."