Yes, tanking is very simple for the experienced player.

A good tank, however, doesn't just keep agro, he also mitigates the incoming damage by his various tools.

I see plenty of tanks run a dungeon, pull all packs till the boss, and then proceed by asking the healer why he died when he goes splat. Then, of course, you didn't see a single rampart, sentinel, sheltron on his buffs nor a debuff like reprisal or the slow effect from Arm's Length on the mobs.