By no means am I a black belt or any type of experience but I am simply giving my perspective. Brazilian jiu-jitsu is GREAT for anyone, if the fighting environment is controlled. Carlos and Hélio Gracie founded BJJ in South America and Hélio was known for fighting and dominating men two to three times his size. You can find his fights on the net and they are impressive.
However in my experiences thus far in life, I have been attacked in my house by the guys I was living with in Phoenix. Yes those environments were closed and no "friends" were around, but being handicapped with one functional arm left me at an obvious disadvantage. During every fight, I walked away intact and able to defend myself. In 2014 I found Krav Maga and now knowing what I do, I would never have gone down to the ground. Standing up has obvious advantages. Even the great fighters like BJ Penn try to stand up and fight. Sure those fights are awesome to watch standing but the fighters know there are advantages to standing versus being on the mat. My daughters will all take jui-jitsu and krav maga, but for me krav has been the best system.
Here is the video the thread title describes.
Navy SEAL Jocko Willink on real martial arts. Keep in mind that he is an expert in Brazilian Jiu-Jitsu.