I came across Crossfit about the time the movie 300 came out (the workout videos on YouTube) and was very impressed. I've been lifting weights for 6 years (acquiring 19 inch upper arms and 15 inch forearms in the process, absolutely 100% no steroids, but then I was always a strong kid) and I've done some limited Crossfit training and it is VERY intense and manly. So it definitely gets my seal of approval.
However, I'm still sticking with weight lifting because I personally prefer "super strength" over Crossfit's "stamina strength". You're never going to get "super strong" by doing something for 20+ reps non stop like Crossfit advocates. It's going to make you hard as nails and athletic as hell, BUT it's not going to allow me to deadlift 500 pounds, a goal of mine. If you want to lift heavy weights like that you have to get strong by lifting around 90% of your one rep maximum, (which means you'll only be able to lift it for 2-4 reps in a set).