I too hate the forced Facebook import. Big drawback IMO.
I accidentally (actually the lady at the ATT store) setup my Facebook account before my sim card contacts were transferred over. Now my contacts are full of Facebook friends (which I can't delete without deleting them from Facebook) and I can't import my SIM contacts.
I understand the ability to switch the contacts between "Facebook", "Google", "MotoBlur", etc.
But you should be able to remove a contact from the phone without it affecting the actual online account.