Yup, I agree with S3cc0. I always have and always will consider this as an exploit, for the simple reason that the devs made the refire rate for nex higher, wanting the nex not to be as useful. But with this exploit it is just the same as before, only that the noobs have a harder time than the experienced ones.
I admit, I do use this exploit to the fullest content, but I would love for this to end, wait the 1.5 secs. Create a equal possibility for all players, not benefit the witty ones (and the already more skilled).
Although it is true that it actually takes more concentration and skill to do this. My aim has gone down because of using this exploit as I concentrate more on firing faster than firing accurately. But still, sometimes I hit every time, depends now how my day and luck is, thus making me deadly.