Seismic slam is terrible

Kind of a silly guide when I read 700+ resist for act 3, 1k+ for act 4. THIS IS SO WRONG, 700ish ALL RESIST IN ACT 3 INFERNO IS SUICIDE. Have you done either of these acts on inferno?  If not, don't make a guide about it.

You need at least 950+ all resist for act 3, 9.5k+ armor d3 items, and 1000ish life on hit.  That said, Act 4 is not significantly more difficult than act 3.  You can probably do act 4 as well with similar stats.

Seismic slam is terrible, and ignore pain is not 100% necessary.  Seismic slam (shattered earth) will only help you with trash, it does practically nothing vs elite packs (which your build should be designed around).  If you can't tank and spank the trash mobs, then your gear is not sufficient for that act diablo 3 account sale, and thusly you shouldn't even be attempting it.

Ignore pain is not a bad skill, but there are simply too many better barbarian skills to justify picking it up when you're soloing.
Warcry, Revenge, and Frenzy are 100% necessary.  Leap (iron impact) is essentially a better ignore pain (if you're at 9.5kish armor, then it'll bring you from 75%~ reduction to 90~%, which is 60% reduction for 4s every 10s).  However, leap is far better due to 1) 10s cool down vs 30 2) mobility and 3) the ability to disjoint projectiles/freezes.  There is literally zero reason to take ignore pain over leap.

Threatening shout is amazing, as it's practically a flat 20% damage reduction.

This leads you to your last skill, which could be ignore pain, but I find furious charge (dreadnought) to be much better  diablo 3 gold for sale.  Here's why: say you're facing an elite pack that you can't tank and spank.  If you chose ignore pain over furious charge, then you'd leap (wait 4s) --> ignore pain --> leap for roughly 15 seconds of immunity.  However, after those 15s you're probably surrounded and dead.  Alternatively, you could leap --> ignore pain --> leap out and then kite for 30s and repeat.  This feels extremely inefficient, especially if the pack is nightmarish/frozen where you may not get in much damage in 11s.

If you took furious charge, then you could leap (4s) --> fight until you're low/surrounded --> furious charge out (for a full heal usually).  Now you can kite for a few seconds, and leap in again shortly and repeat  selling Diablo 3 account