I'm gonna say something unpopular: I don't like to rush.

[xxvaynxx]

Indeed, but not comparable, as that would be the equivalent of the tank only tanking one mob in that pack.

There are tanks that do that.
there are tanks that pull the mob and focus on one mob until its dead while dps are tanking the others because they're not paying attention. This has happened to me in leveling roulette more than once and they wasn't bot.
Useless tanks are useless.
I beat you're ok with that though because they're "tanking"

But since you're so hung on the "You're not tanking" since you totally omitted the rest of my post.
Take it as, you're not playing tank well and you shouldn't play tank if you can't tank more than what a geared melee dps can. Specifically (samurai ,mnk or drg)