Seriously, why is everyone hating on Meredith? There are two kinds of women in the world, Matthew women and Ian women -- if you're one you probably don't understand the other -- and it sounds like most women on GC are Matthew women. Here's my theory:
From the sound of it, there are more Matthew women -- women are crazy for him, everywhere. Matthew is the kind of guy who says everything you want to hear. He impresses your parents and your friends by talking about how much he cares about you and he wants to get married. He's stable. He's safe. He's sweet. You could marry him tomorrow and he would stay with you for the rest of your life, no question about it. Matthew women are traditional. They like that safety and stability, often finding that the most important aspect of a relationship -- the commitment, the knowledge that someone will always be there. They're impressed by the fact that their family and friends are blown away by the perfect things he says. When they're with him, they feel safe and secure.
Ian, on the other hand, can't really be explained. There's just something there, and you don't always know what it is. It's passion, or excitement, or something. A woman feels butterflies when she's with someone like Ian. He doesn't make promises he can't keep, and doesn't always impress others because he can be quiet and he doesn't want to say things unless he really means them. Sometimes he may come of as aloof, but he's sexy and a woman knows that she will never be bored with him. A relationship with him may end in marriage -- it may last a lifetime -- but it may not. You never know. An Ian woman has a lot of self confidence, and doesn't always do what is expected of her. She loves adventure and excitement and trusts the feelings that she has even if others don't always understand.
ETA: I would take Ian over Matthew any day. I hope they're very happy together.