Pretty interesting to see the two camps on this one. I met my wife in college and we've been together 20+ years and now have 2 little girls (they all love to go out fishing with me by the way). I couldn't imagine myself being any happier and would go through all of the good and bad all over again without regret if I had the option, but it is a lot of work. Marriage is just like anything else in life... if you don't put forth the time and effort to learn a trade or get an education and only care about yourself, what kind of job/career are you going to end up with???
The marriages that have crumbled around me generally soured due to a collapse in communication, a lack of meeting each other's needs, and living in a performance-based relationship (you do something nice for me, I'll do something nice for you; You be mean or rude to me, I'll show you just how mean or rude I can be, etc). Once the downward spiral starts it's incredibly difficult to make it stop. It's teamwork and sometimes you have to pick up the slack when your partner's struggling and at other times she'll do the same for you. You spend the most time on the things most important to you, and it's safe to say that the vast majority of marriages ending in divorce do not have two people 100% dedicated to the marriage.
If someone is in a place where sleeping with multiple women, making and spending a lot of money on whatever they want, and the idea of kids seems likes a death sentence to life, then please, pretty please, do NOT get married. This thread reminds me of that movie "Ghosts of Girlfriends Past" with McConaughey, Jennifer Garner, and Michael Douglas where the "player" eventually dies all alone due to his lifelong love of self. I know that when I look back on my life I'll cherish the time I had with my wife and kids and won't be regretting the lack of one night stands and luxury vehicles and toys I could have had if I stayed single, but that's just me.