One of my recommendations came from someone that doesn't speak English and has no idea at all about MBA admissions. Unfortunately, all of my current contacts are more or less like this, and I felt it was necessary to get a recommendation that reflects my current business experiences. I had to get these recs translated, and given the source, they were pretty generic.
My other recommendation came from a prior boss who I have a great personal relationship with. I did 10 applications and I was shocked by how much effort she put into each individual recommendation. I bet she spent 50-60 hours on my recommendations. I didn't read her recs, but I do know that she is one of the best writers that I know (litigator and English major). I spent some time buttering her up (telling her she's the best writer that I know and that I needed her help, etc.) and laying out areas where she could help me in my application. I have no doubt that her recs made huge impacts at certain places.
I believe that, by and large, most recs are pretty generic; and I think that schools know to expect this. Most managers look at rec writing as a necessary chore - but they also know that the person they are supporting will likely be gone in 6-12 months. A solid, generic recommendation will not kill your application. On the other hand, a beautifully written persuasive recommendation can separate you from the crowd. These are rare, and I have no doubt that it reflects very positively on applicants that get them. Obviously, it would be a great benefit to get one or two of these for your app package.
As deadlines approached last year, there was some discussion about how recommendations limited applications. With my applications all in R2, after a couple of rejections I definitely felt like turning in a few more. I didn't because it would have been too much to ask of my recommenders. On the other hand, as I was preparing my applications initially, I got kind of burned out, and I didn't feel like completing all the apps I originally planned. But since my recommenders had put in so much effort already, I felt obligated to put forth my best effort and complete all the apps I requested recommendations for. It works both ways I guess.