Been married 20 years.... seems to be going quite well so far, still waiting for our first argument.
If you find someone who has similar tastes/humour/outlook on life, then it can be one hell of a ride. If you find someone who is going to moan and bicker at you for doing stuff you like doing...then I don't know what people are getting out of it. But I guess it depends on what type of person you are.