I agree wholeheartedly. My sister is a single parent, and has never had any option since her son was born but to work. She is both mother and father to her boy. And though I am myself a stay at home mom by choice, I can never for the life of me belittle her herculean task, and assume for even a second that I am a better mother than her.
Being a good mother takes far more than being attached to your baby 24/7!