I am 280 Ilvl and I rock in delves with Valeera as Tank.
I use the ping system to get her to attack and aggro mobs and frankly, it is a lot easier than doing delves with my tanks.
Having a good time… 
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Dude, positive posts are not allowed on these forums.
For real though, good for you! I will probably level my priest in S2.
Her tanking passive “Blood-Stained Blades” works really well atonement healing. She’s basically at max 12 stacks constantly.