Easy tank to learn?

[fulminating]

WAR's kind of unweildy in dungeons now that the cone is gone - I'd recommend drk to have an easier time handling mobs.

Both of the tanks that are available from level 1 are easy to pick up and learn. They don't get that much harder going into the late game, either. If anything, the harder to learn tanks are probably DRK and GNB, with DRK being the one that is the most difficult to play due to having a lot of bloat in their kit. Gunbreaker is fun and sort of plays like a melee dps / tank hybrid, though it does have some rather interesting "clipping" issues on some skills.

Paladin is probably the most difficult to play well because of all the weird optimisations that simply aren't present in other tanks.