Well, I consider myself very fortunate to have not been married until I was a bit older (33). I had some serious relationships that might have ended in marriage (and that would have been a mistake) but I was too involved in my education. One guy did me a favour by being "too scared" to propose for the longest time. I would have said yes, and looking back knowing what I do now it would have been a huge mistake.
By the time I met my DH, I had learned a few things. Do I believe in true love? Yes, I do. But I don't define it the way I used to. In the past, I felt an attraction to someone first, and then worked from there. I realize now that many of my relationships were based on a physical attraction (pheremones probably) that has little to do with the important things in life. I learned that you can truly love someone, yet they are totally unsuitable as a husband or parent.
DH and I didn't start out with physical attraction. In fact, I hadn't seen him in 10 years when we were reunited over the Internet. But I did remember certain things about his personality. I remember that he loved deeply, that he wore his heart on his sleeve, that he really wanted to find "mrs. right", that he wanted a family and kids. I remembered he was loyal and very willing to fight to the stubborn death to keep a relationship working. Then there was his gentle nature (no worries about child discipline issues) and very laid back/easygoing (which has made him perfectly adaptable to AP, he's a natural!).
The money thing isn't a huge issue, but I have to admit I probably would not marry someone who didn't have some earning potential. It has been very important to me to be a SAHM when my kids are babies, and with my DH I can have that. If I had to be the sole breadwinner, I think it would have really torn my heart out to not be able to stay home with my babies.
The maturity thing..well, I think my DH is pretty mature, definitely alot more so than my past boyfriends, so I think I scored well on that part. And yes, I would marry him again in a heartbeat!
I often see posts by people who are having major conflicts with their spouses while they are dealing with young children and my heart goes out to them. I can't imagine fighting over whether or not to spank or cosleep, or to have a DH who isn't supportive of AP, who doesn't respect me, etc....It's one thing to have marital problems before kids come along, but I simply cannot imagine the pain of having to share custody, especially if the discipline/parenting philosophies are different.