While disadvantage on an opponent's attack sounds good, you can actually save your allies from taking damage by ending the fights earlier, which is done with the extra damage from two weapon fighting.

Plus, it's entirely situationally dependent. However it requires you to stand very close to an ally and doesn't actually do any damage. You will have +2 AC because of the shield you need to use the protection effect. Your main disadvantage at this point with TFW is not having a shield, but you will do more damage from here on out as a trade off. At level 4, you can take the dual wielder feat, and then two weapon fighting will have evened out the AC difference. The only advantage this has is that you can get it earlier than your first feat, but only by a few levels. The defense fighting style gives +1 AC while wearing armor.