DH and I got married right after he graduated form college. We didnt' bother with a big wedding, just eloped. I am 11 months older than DH so I finished college a year earlier than he did. WE waited for him to finish so he didn't have any additional responsibility until graduation. He graduated on May 10th, we eloped on May 25th.
My sister did not wait, she married while a college Sophomroe, but the time she graduated college, the two of them resented one another so much the marriage ended the next year.
If I had to do it all over agian I would wait, it is just easier and if you love each other the "wedding" won't matter--you can still have a religious service even if you do not have the "big wedding". We got married in a church after hours, by a priest and invited my sisters, parents, his parents and two aunts. My parents could not make the time to come, but after 18 years we are still very happy!