the break down of cross fit:
the good:
good for loosing weight, and just increasing your athletic abilities, satisfying those people who think anything is "boring", team atmosphere, new challenges every work out. no other sport has introduced as many people to the barbell as crossfit.
the bad:
not a efficient tool for training (training is the repetition of a similar workout to train something, i.e. increase bench press), the not so good coaches outweigh the good coaches by quite a bit (getting a certificate within a week of going to a seminar doesn't make you a good coach), injuries are quite common - many people go home thinking they did great and they really took it to their back, little do they know - they should be taking a week or two off to let their actual injuries heal. most of the works outs aren't new, but just simply advertised by crossfit.
in the end - if you enjoy it and see results you like, there is nothing wrong with doing cross fit, or any other fad (because crossfit is just that, something else will come along). Just be safe, and do your own studying of what is correct form for exercises that can really hurt you - dead lifts, squats, cleans & jerks etc. (because if most people have just walked off the street with little to no previous training and haven't been reamed out for crappy form multiple times, chances are your coaches aren't looking at form close enough).
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