MMA is a competive sport, not street fighting. The type of grappling you see in the octagon never happens in real life. Besides, most of those guys have years and years of experience in at least one martial art or sport. Are those guys in MMA badasses? Of course. It's also completely impractial for the average person.
Krav Maga is the only martial art based around real life situations and crippling your opponents as quickly as possible. With some minor training a cane becomes a legal stick of death.
"In Krav Maga, there are no hard-and-fast rules.
It is not a sport, and there are no competitions. All the techniques focus on maximum efficiency in real-life conditions. Krav Maga generally assumes a no quarter situation; the attacks and defenses are intended to inflict the most pain possible on the opponent. Groin strikes, headbutts, and other efficient and potentially brutal attacks are emphasized.
The guiding principles for those performing Krav Maga techniques are:
neutralize the threat
avoid injury
go from defending to attacking as quickly as possible
use the body's natural reflexes
strike at any vulnerable point
use any tool or object nearby
The basic idea is to first deal with the immediate threat (being choked, for example), prevent the attacker from re-attacking, and then neutralize the attacker, proceeding through all steps in a straightforward manner, despite the rush of adrenaline that occurs in such an attack. The emphasis is put on taking the initiative from the attacker as soon as possible."
Although Krav Maga shares many techniques with other martial arts, such as Boxing, Savate and Muay Thai (for the punches, kicks, elbows and knees) or Ju-Jitsu, Judo and Wrestling (for the grappling and disarming techniques), the training is often quite different. It stresses fighting under worst-case conditions (for example, against several opponents, when protecting someone else, with one arm unusable, when dizzy, or against armed opponents).
Krav Maga is the official system of hand-to-hand combat and self-defense employed by the Israeli Defense Forces (IDF), Security Forces, the Israeli Police and Military Police and its Special Operations and Anti-Terrorist Units. The IDF including their Special Forces Units, Israeli Police, and Internal Security Branches currently uses this style on a day-to-day basis.
In the United states, personnel from various Federal, State and Local Law Enforcement agencies and Military units around the world have received training in Krav Maga, including: the Federal Bureau of Investigation, AFOSI Anti-terrorism Specialty Team, United States Marine Corps, United States Marshals Service, Bureau of Alcohol, Tobacco, Firearms, and Explosives, Drug Enforcement Administration Arrest and Control Unit, U.S. Treasury Department, Immigration and Naturalization Service, State Department, Central Intelligence Agency, several divisions of the U.S. Coast Guard, and police and sheriff's offices in New York, Illinois, Texas, Alabama, Connecticut, Pennsylvania, California, and Maryland. In addition to the Special Operations Forces of Israel (i.e. Sayeret Matkal, YAMAM, etc.), several special units from other countries have adopted this system for their hand-to-hand combat. These units include GIGN, FBI HRT, and SWAT, among others."
http://en.wikipedia.org/wiki/Krav_maga
