Complicated situation.

My fiance and I have been together almost 3 years. He has two kids with two different women and I am not impressed with his parenting skills or effort. He has been really pushing the issue that he wants children with me ( I have none). He says that this would be the first time he has a child that he could raise under the same roof, and first child he ever planned. I have never been someone who needed to have children, I was more or less thinking I would consider it if the situation was almost pregnant. I love him, but as a parent I give him a thumbs down. His children haven't even met. It's so weird to me coming from a blended tight nit family. What would you do? Consider having a child or absolutely not. Btw, i never cared whether I had or didn't have children.