I played a tank warden in vRoM HM last night, I struggled a lot with resources despite being an Argonian. We gave up on HM after a few tries. Those issues will be even bigger if you have no reliable resource restore racial passives. I'd recommend an Argonian for that resource return on every potion.
Perhaps I shouldn't start tankign vet HMs with RoM though, was probably a L2P issue!
Hmm. I thought Wardens have great class opportunities for sustain as tank. They have netch that can be morphed to stamina (and it would be good for stamina return while blocking), They have healing passive than returns lower resourse while healing (great to use with vines).