Bioblaster makes the rotation clunky but I dont find it to be that useless. Slowing one guy or a whole group can create opportunities for your team mates, and it can be useful in combo with wild fire.

I got a lot of kills out of the wildfire drill bioblaster scatter shot combo, people don't think much of it because it doesn't look very bursty at first other than drill and they tend to get caught unaware by the 3x increased wildfire hit that follows.

But yeah, it's clunky.