Gosh darn it. I only check MT once a week or so and I miss great topics like this. David Kahn of IKMA says it much better than I can:
Israeli Krav Maga - Cherry Hill. I think that's the right link.
Here is my perspective to the topic of "Bad Krav". There is a major push in the Krav Maga world to keep "Krav Maga" from becoming a generic term like Karate or Kung Fu. Krav is very systematic (step-by-step.) Most true Krav Maga schools require students to say out the movements step-by-step so that they aren't leaving anything out. Every move has a purpose. I think a perfect example of Bad Krav would be anything that steers away from the systematic movements of Imi Lichtenfeld's Krav Maga system or his approved modifications. I'm not saying that any additions to Krav Maga are bad, I just am saying that too many additions can change the system and it stops being Krav Maga. It would be the same as adding a bunch of stickfighting, straightblasts, and trapping to Tae Kwon Do; there would become a point where it stops being TKD by definition. IKMA has added more groundfighting, but this was done with Imi Lichtenfeld's permission; the same with any additions by KMWW.
Aside from the point of bad instructors (there are plenty of those) it needs to be pointed out that bad Krav is anything that is not "Krav Maga" by definition. Krav Maga is a relativity new system of self defense. All of its instructors have to be linked back to Imi Lichtenfeld or it simply isn't Krav Maga.
There are two ways I would define the topic of "Bad Krav". One would be looking at what makes up "bad technique" of real Krav Maga, which is what I think Runs with Fire was intending, and the other would be what makes up a "bad version of the system of Krav." An example of "bad technique" would be not stepping offline and turning the shoulder away during a gun defense or not pinning the gun to the person's body before the disarm. An example of a "bad version of the system of Krav" is when I blend too many sidekicks in with my club defenses (which I am totally guilty of.) Sometimes my stuff becomes Krav-fu because I blend my martial arts training in with Krav Maga. When I do that I am practicing bad Krav. That doesn't mean it's not effective, that just means it's not Krav Maga.
If you train with any of the following organizations, or have lineage back to them, you are getting good Krav technique. I may be leaving out some, so my apologies in advance:
KMWW
IKMF
IKMA
KWG
KMA
This is just off the top of my head. I know I'm leaving some out., so I'm sorry if I did. If you train at a Krav school that doesn't link back Imi's students, I'm not trying to put down what you are training. It may be very, very good, but you run the risk on not getting actual Krav Maga training.
Just to add, if you are in Southern California and have a chance to train with Mike Mihalkanin (MMA Academy/Darren Levine lineage) or Dana Ben Kaplan (IKMF), they are both excellent Krav instructors. IKMA (David Kahn) has an instructor in Los Angeles (Alex O'Neil). I've never trained with him but IKMA is excellent.