Consensus? Has someone done an actual survey or a study?
If you train, you will probably fight as you train. The techniques that you learn and repeat are the patterns that your brain will follow under stress of combat.
BTW how does the typical MA fighter respond to someone who picks up a metal pipe (2x4, rock, knife, gun) and proceeds to attack the MA fighter? I would hope that (s)he would do the reasonable thing: get the hell out of the area!
Avoidance & evasion are the most useful "martial arts".
Oh god no, there are no studies as far as I know. But what I refer to consensus is the general feeling one gets by browsing martial arts forums. There used to be a great forum on this very subject - bullshido. For years and years folks have discussed these exact questions of effectiveness of deadly martial art techniques.
> Avoidance & evasion are the most useful "martial arts". Goes without saying!
Or just try to imagine a situation where someone who doesn't constantly train sparring can kick a knee of a kickboxer who does spar a lot and gets kicked a lot.