while it is very noob friendly in early stages, in higher content i think tanking is much harsher, when i first started tanking it was easy, then i reached dlc vet dungeon in the first time, and found out i know nothing about tanking.
it is also much less forgiving from other players, if a damage dealer dies he can be easily resurrected, while if the tank died it often might mean a wipe.
also mechanics are different from dd's and tanks. tanks can ignore a lot of them cause damage is too low for them to care, while dd's cant.