My RE also didn't use it because it wasn't approved by the FDA. More studies have been done on Clomid.
I believe the other issue is that it's not FDA approved for infertility. It is a drug that was developed and used to treat breast cancer. My RE didn't use it either and I think that was the reason they gave me - not success rates.
It sounds like you live in Boston, do you? My RE, who is at Tufts Medical Center, does not prescribe Femara either. I thought it was weird, too, but she claims the same as your doc, that the success rate on it is very low. She upped my Clomid this cycle from 100 mg to 150 mg. I did alright on it, not too many side effects. I just felt c rappy and headachy for a few days. I doubt we'll ever conceive, though. I'll be 42 next month and have diminished ovarian reserve. If you do live in Boston, and want the name of an awesome acupuncturist in Brookline, let me know. His success is huge!
~Sue