It was broken as fuck. People who abused knew it was. Just like people with spamming JLI when they were ridiculous, it was easy peazey to spot a grade A shitbag if they were using or abusing this.
It was OP but the nerf was a bit too much. Reducing the range wasn´t really that great of an idea. Maybe making the cannister rounds cost muni and be a timed ability would have been better. Something like 20 muni for 10 seconds of cannister rounds. That way it would have been in-line with Zis3 and SU76.