BookBarbarian
Expert Long Rester
Have you seen it in play? I haven't. I did wonder about it, but first it only works 1/round and it seems like a tank would like to take more than that. Second it takes away your OA, so you lose stickiness. And of course you have to survive to 5th level...
I've played it. At first you have to play like a Rogue. Don't expect to go toe to toe with anybody. Attack from Range, and after level 2 bonus action Hide. 14 Dex will only be 5% behind 16-17 Dex which is the highest you can start out with at AL. I would definitely get a Breastplate ASAP though.
16 AC in Breastplate is pretty good and doesn't give disadvantage on stealth checks.
I still recommend grabbing a Level in Barbarian for Shield proficiency. I like it best paired with the Shield Master feat, as bonus action shoves will give you advantage for sneak attacks. High Strength and Athletics Expertise will mean almost guaranteed success against anything that isn't huge or larger. If you want some stickiness, grapple that foe. It will cost you one round of damage, but it will keep them in place.