Screenshots (Pardon the amateurish quality)
Rakanoth and Ghom - http://i.imgur.com/a3aIB.jpg
Skeleton King and Maghda - http://i.imgur.com/4IOGB.jpg
Siege and ZK - http://i.imgur.com/cplLg.jpg (I forgot 5 stacks here)
Rakanoth and Ghom (Sword and Board. Buff DPS 120k) - Difficulty 3/10. Honestly this is a fight that you literally stack LoH and troll them to death. I died in the first run as I was too cautious and hit Rakanoth's enrage timer. My advice is to kill Rakanoth first followed by Ghom. Rakanoth hits hard while Ghom is simply a meatshield and poses little threat at all.
Tip - None. Snoozefest.
Skeleton King and Maghda (Sword and Board. Buff DPS 120k) - Difficulty 6.5/10. I was careful coming into this fight as I saw a stream and the toon was taking big damage. With a sword and board, this is again a very easy fight. Skeleton King's dash strike and PBAOE is pretty strong. There however are quite a few mobs for you to leech life off from. You start of the fight going after Maghda following which she would shield herself and would remain so until she is the only mob left. You go after Skeleton King and it's a straight forward WW fight. After he goes down the Maghda fight comprises of 2 phases which repeats. 1v1 against Maghda following which she would shield and cast adds. Rinse and repeat until dead.
Tip - Wear maximum mitigation vs Skeleton King and swap to DW vs Maghda.
Siege and ZK (DW. Buff DPS 180k) - Difficulty 8.5/10. This is a fairly difficult fight on 2 levels. Both are them are related to Zulten. Zulten would frequently cast a ground bubble which slows movement, regeneration and attacks. You need to kite Siege outside of the bubble if not you would not hit the DPS timer. When you have the opportunity, WW Siege. If there are bubbles around Siege, kite him away from the bubbles (if ZK is far away, hit him and Siege will follow). After Siege is down fight becomes simpler BUT there is a hard enrage. You need to kill ZK as quick as you can if not he would 1 shot you. Again, kite away from bubble if possible. ZK has this very annoying habit of cosying up in his bubble so you would have to lure him out. I died twice in this fight.
Tip - Wear maximum DPS gear. Fighting anyone with bash / frenzy around the bubble is not advisable and should only be done if no choice. You would not hit the DPS timer and ZK will one shot you.
I much prefer going SnB for the first 2 fights. At no point in time did I feel I was close to dying. If Siege and ZK did not have a hard enrage, I would SnB this too. Overall fun fights and decently geared barbs should do well.Stack up on crit chance and IAS.