My boyfriends parents got married after accidentally falling pregnant when they were 19/20. They were both in university with no money and no jobs. They have now bought and sold 3 houses, moved over from Ireland, they've got 2 kids, a nice car and one's an archaeologist of Roman artefacts near Hadrians Wall and then his Dad works at Newcastle University, has his doctorate degree and plays a big part in tests for Cancer Research.
It does work and I've seen just as many divorces from supposed established marriages as I have from the rushed marriages. Obviously you need to feel something for the other person, otherwise it really is a losing battle.