Well people, I have practiced jiujitsu myself. And I sure know the effectiveness of chokes and submissions.
The techniques are effective, but in a certain context. For example jiujitsu with a gi or without a gi, or jiujitsu for MMA or for treet fighting.
Its not the techniques temselves, but more the strategies and the context in which the art is practiced that are the problem. Jiujitsu is not made to cope with strikes, thats the bottom line.
Thats why MMA and jiujitsu are two different things. When you are alowed to hit, everything changes. You can't work from the bottom anymore... If you do, you just give your opponent an easy target.