I like it because they look like complete idiots when I kill them. I can see them coming, they run off behind a wall then think jumping back out like a looney will mean I miss. I just aim up a bit haha. The worst thing that can happen is they dont jump, in which case I aim down a little. It's a bit harder when they jump off objects but then your aim messes up when you do that so it's not always a win for them.
It's the drop shotters I don't like because the sucky hitboxes mean it's tricky to take them out.
On the modded controllers subject - I don't really care. If you feel you need to invest in them in order to win then it's you that has become that obsessed with winning.
I saw a 3arc Dev video, I think it might have been Vonderhaar talking about the new DLC and there was a controller in the background that had one of those Control Freaks on the left stick. Therefore they are obviously not frowned upon in general.
I hate it...but not because of the mechanics...
People think it works because it takes players by surprise...not really. It works because it simultaneously shuts off aim assist(not sure why) and the lag in this game makes it so they look like they are standing up doing nothing for a good half second before it teleport-prones them if you haven't died already.
If they fixed the aim assist and lag comp issues I guaranted it would not work. Players did this even back in MW3. It didn't work. Its a rare case that it might actually give you any benefit.