I have two wonderful boys. However there have been some crap times with my eldest spending two of his first four summers in hospital. I remember the horrible horrible feeling of not knowing if he'd reach his first birthday. I'm conscious some parents have it much much worse. The intense love you feel for your kids can tear you apart when things aren't going well
I think my point is that I agree with Crikey in that the fantastically positive responses on this thread are probably a result of the way you asked the question. There are some terribly sad stories out there too.
When it's good there is nothing better and it's pretty top notch at the moment, but I can't pretend to be able to advise you one way or another. I can answer your question though; yes, I always knew I wanted kids