A lot of people hold the opinion that arts/combat sports like BJJ, wrestling, muay thai, mma etc. are only marginally effective for fighting because all someone has to do is brab your nuts or eye gouge or something like that. They don't train you to handle real fighting o nthe street or whatever. and to soem degree that's true (jumping guard in a street fight is incredibly stupid for example, and leg locks should also be avodied), however the core concepts will apply no matter what someone does, dirty fighting or not. Here's why- http://www.sherdog.net/forums/f12/video-draculino-vs-ball-grabbers-1560623/
I'm certified on level 1 Army Combatives. It's the new hand to hand system of the U.S. Army and is basically all BJJ and wrestling till level 3. We get a lot of criticism (especially from old school vets and wannnabe civilian survivalist types) for teaching submissions, grappling, not teaching ball shots, eye gouging, fish hooking, face stomps, etc. Granted I think we go a little TOO deep into submission work, the BJJ approach to position control and the wrestling emphasis on dominating a clinch or being able to escape at will, saves lives in the cage, on the steet, on in a war zone.
I post this because it's a widespread idea that if you spend all your time doing pre-arranged sets of ball hitting and eye gouging and other dirty moves, you'll be better prepared than someone who spends all their time sparring hard, learning to control distance and position through "sport" fighting. THAT will get guys killed. BJJ is just fine in the street, not everything is applicable technique wise but the principles and core techniques are icnredibly applicable and allow trainign with force while maintaining safety which is why the military uses it now. At level 3 and 4 striking is added but technically it's all still mma. However, training is then done in full battle rattle while doing room clearing MOUT drills and having guys roll while one guy is secretly given a tazer knife. That is good RBSD. This: http://www.youtube.com/watch?v=RKfcoBfp4K4
is not (however good it may be as a father-son bonding experience. And I will say, it does have SOME value, it's not totally worthless but that kind of thing should not be a major part of training for SD or fighting).