There are already several discussions going on about this right now:
(see my response #117 in thread above)
The upshot is:
- getting an offer to submit LOR doesn't necessarily mean you are borderline - YOU should know if you are borderline based on the Freshman Profile and your own stats - some VERY qualified candidates are also getting the email.
- do everything in your power to submit them - there are no guarantees they will help, but if you don't, and you don't get in, you will ALWAYS wonder if you missed an opportunity to give the admissions folks a more complete and favorable picture of yourself. Who needs that kind of regret?
- if you don't get the email, don't sweat it.