Just wanted to say, that I've been working on building a warcry barb for a little while now, and I am having an absolute BLAST with him. I would, however, like to point out a few things.
There were a few people asking about Howl, and why you would max this before taunt. In my opinion, having enemies run screaming is better than having them come close to you. Taunt is all about getting the enemies to you, it does this effectively with one point. Howl, on the other hand, gets to have a radius equal to the entire screen, and will send monsters scurrying off into corners for 30 seconds easily. You want crowd control? That's your ticket.
The serpent lord staff idea is actually a very good one. I won't use it myself, because I use dual hotos on switch, 15% req jewel wizzys normally. I originally thought the hotos would be better... I find going from 850 to 1200 mana makes a HUGE difference. Add in the 15% mana regen on each and you have a winning combination. However, I would like to point out the utter uselessness of a Jah rune in it. You would only be using this Noobstick against Monsters. Please take a look at Battle Cry :
Level 20 battle cry : 57.6 second duration, -44% target damage, -88% target defense
The defense reduction increases 2% per level. With level 26 war cry, you reduce an enemy's defense by 100%. Why waste a Jah rune when 5 mana does the same thing?
I haven't got much experience as far as mercs go, I'll be leveling one myself shortly - probably an act 2 might merc, try and work my way toward giving him an ethereal cryptic axe doom. But then, I play pvp so I need that extra damage.
What would I like to see added to this guide? Perhaps some advice on the possibility of 200% fcr casting - it reduces your damage, and your mana cost, but WOW will I be casting quickly when I get my 20% fcr ammy. It's expensive, not for those without deep pockets, or the willingness to try and get hold of some unusual items. I picked up a 2 barb skill, 20 fcr, 18 res all circlet for approximately a pul rune on nonladder. cheap!
Also, any advice on pvp would be good. I've found it difficult to deal with ww, due to it being uninterruptable. It's tough to win sometimes, but that's more to do with my aim than anything.