he was no easy... he was not hard... he was fun!
I did this fight in just under 15min using a Ground Pounder and BMG... First stage I just used the ground pounder as the area effect takes a big chunk of HP each time you hit him.... second round BMG for quick chain targetting his decoys and then last round Ground pounder again... did round 3 in about 2minutes.... every time he does his teleport to you... shoot 3 grenades at the ground and move to safety.... just before he lands hit detonate and watch as 1/3 of his health goes in 1 hit. repeat and you can finish the final round in 3 hits in little less than 2minutes.
I had to self revive once.... but this was because I got ****y :) overal simple and rite difficulty to make it a fun fight.