I was looking at a three part abishai set for a long time but in the end I didn't think it was worth it. With the exception of the disintegrate guard on the boots and the shocking blow on the gloves, I think that with the exception of the cloak, the base items themselves are very very poor compared to other items. The only saving grace is the set bonus, which I don't even think is that good.
The AC and evocation boosts do not matter to a low AC barb and the strength is only +3
This is, at best, +3 two handed damage and +2 attack. The attack is redundant on a raging barb.
If I use the boots slot, I don't get madstone which is a near permanent +2 str/+4 con and two minutes of +4/+8.
If I use the Bracers or Gloves slot, I don't get to use the claw set which is +4 damage, 30% healing amp and +2 exceptional con.
Even looked at individually, both the boots and the claw set would almost be equal to the +3 str for the chrono set. When you combine this with the fact that you are very nearly wasting two slots on this combo (cloak doesn't count as wasted) it looks very bad to me.