The final season of Scrubs is not a good example of what makes the show so great to watch. Most of the jokes and plot-lines have been changed to try and attract a younger audience, with only a few cameos from the original cast to try and keep things “relevant” for those of us who watched it from the beginning.
It's not as bad as many reviews make it out to be, but certainly it's not a must have DVD for your collection – unless you are a completionist like me. Worth a watch at the right price but you can get the far more entertaining earlier seasons for the same price if you haven't watched those already.