And to keep a ranged distance(and thus take less damage), you have to kite.
And that's why the ranged characters have kiting skills or other skills to keep monsters away from them:
DH: vault, caltrops...
Wiz: freeze, teleport...
WD: pets, horrify, spirit walk...
I haven't seen any skills like that on the barb.
There are skills where you can. Strafe is a classic, maybe. Plus, you can leave caltrops or spike traps on ground, and while you kite away, demons take damage, same with sentry. There are many skills to slow monsters down, or completely disable them (Wiz and WD have a good variety of them).
And they do!
First barb with highest DPS in world appears on rank 68 (in softcore, and 62 in hardcore), after any other class.
As it is, barbs are the ones with by far the most dps... which makes zero sense.
Obviously, they are not. The whole opposite: the are the ones with the least dps.
And, as I mentioned before, they are not even the best survivers, actually the worst (in hardcore); WD is:
However, a barb can tank well. That is what they were made for.
Well, it's a barb, right? Why should a barb kite? Maybe only if he is not prepared for the mp level he chose. CC immunity is necessary since he has to tank. He can not kite away and do damage from distance because he is not ranged. It makes sense to me.
That he can have "eternal" cc immunity, however, requires some really good gear and skills. It's not that easy to keep WoTB up all time (particularly after the nerf). Plus it doesn't make immune against arcane beams etc. And also monks, who are melees, have certain skills to get immune or can heal.
As for lifesteal, DHs can get even more LS:
3% on weapons (6% if dual wielding) + 25% on Gloom-Blood Moon + 3% Nether Tentacles = 33%
3% on weapons (6% if dual wielding) + 3% belt + 3% Bloodthirst + 9% Rend-Bloodlust = 21%
(Dread Spear with 60% LS isn't really used. Maybe because of the cooldown and low damage in short time. Maybe someone can explain better.)
Here, procrate must be considered (I don't have the insight on that, sorry), and the DPS, which LS is based on. Naturally, DHs have much higher DPS than barbs so that DH benefit much more from LS than barbs do.