Besides the doing of the actual quest, what's the advantage of being bloodkin to the Orcs? I can still mine their veins for Orichalcum and pay the dowry for that one female Orc so that she'll be a lifelong follower (and a really strong follower at that). Is the only difference that they don't get annoyed and call you "Outlander" when you're taking their ore?
I think it is possible to buy and sell within the strongholds.
I would like to have significant differences among the races. Of the racial traits, I've only found the Breton and High Elf traits useful beyond the early levels. As a Wood Elf, I would like to have something in archery (for example) that no other race could attain. The starting skill level is neutralized at level 100. Then there is nothing "special" about the Bosmer archer.
Also, I would like to have seen at least some small difference between male and female. As it is, it seems like any character can do anything. I thought it was weird having a Bosmer character go to Sovengard (or join the Stormcloaks).