As a newlywed I get frustrated by how many negative comments I get from people who've just learned I've tied the knot.
My marriage is not perfect. Obviously. I wouldn't trust anyone who claimed otherwise. But overall? It's pretty great. I've complained about him on here, sure, but I spend most of my time with him. He's bound to bug me, lol. And I him.

I think people end up thinking they've compromised too much that they resent the partner. In truth, they haven't compromised at all.

The main reason you may be seeing failed marriages around you is because like attracts like. My husband and I have rules set in place concerning other couples. If we don't like the way they live, their dynamic, etc. we won't be friends with them. We want to be around people like us. People who get us. If we sense a couple has issues we'll stop returning their calls. So maybe you see failure because instead of running away from you, another failing couple will latch on because you have things in common.

I also think people get too caught up in the "Is this all there is?" mentality. Your partner isn't responsible for your happiness. If you feel you're missing out on something go do it.