Hey redfield,
That is correct - for most of the good schools. Assuming you have decent undergrad gpa (say 3.3+), and an awesome GMAT score (say 750+), then you will be looking at top 10 or top 20. I can assure you that ALL of them have different questions. For example, Carnegie Mellon focuses on your potential and coach-ability,
" If you were to coach this candidate with respect to how s/he works within a team, what would you advise that s/he does well? What would you advise the candidate to do differently? Provide specific examples that support your advice.
If you were to coach this candidate on his/her professional development, in what areas would you suggest s/he focus? What are the areas of strength on which s/he can build? Provide specific examples that support your advice."Whereas MIT got a more well-rounded approach in this regard,
" 1. How long and in what capacity have you known the applicant?
2. How does the applicant stand out from others in a similar capacity?
3. Please give an example of the applicant's impact on a person, group, or organization.
4. Please give a representative example of how the applicant interacts with other people.
5. Which of the applicant's personal or professional characteristics would you change?
6. Please tell us anything else you think we should know about this applicant."And Notre Dame (top 30) focuses on the details, and asks your recommender to rate you on your ethics. So if you try to have a one-size-fits-all recommendation letter, then you will get into.....none of the schools.
That being said, I did hear that most second or third tier schools are okay with just receiving a recommendation letter on its own. So if those are the ones you're aiming for, getting one will suffice.
Either way, I think it's better to wait out for a bit so your manager gets to know you better - and you get to know your manager better to know if you should even ask him or her.