Are you saying that RDR's grass is horrible because it isn't thick and lush but rather separated?
Do you realize that that is how grass is supposed to look in a desert?
I live in a desert in Arizona. And the grass is WAY more dense than that. I suppose the question should be for you. Have you ever been to a desert?
Not only that, but we aren't talking about real life deserts. We are talking about what grass should look like in both of these video games. Skyrim trumps RDR in so many ways it's nearly indescribable. Fortunatly, we have pics. Look at these pics of grass and compare them for yourself.
http://spong.com/asset/347681/11/24519/entity
or
http://www.game-debate.com/games/index.php?g_id=1070&screenshot=Red+Dead+Redemption&image=9
It's obvious which one is better even on consoles. If you own a pc, you should be excited. If you own a console, you shouldn't be discouraged since it's so much better in Skyrim.