i've found that with slag in its current state, it's more effective for me to run around with a flame of the firehawk and slag guns rather than going rage mode or shooting real guns
although with kreig having +320% elemental effect chance and +180% weapon swap speed, slagging robots and swapping to corrosive is super quick, not to mention he never reloads since with +450% mag size he has 100-400 bullets on pistols and smgs
i do like how nuclear will be a DoT, but i hope there will be plenty of ways to apply it besides guns or not have it quite as mandatory