Its the worst LMG and one of the bottom guns in the game.
I personally think that they are all good LMGs. Not one rules supreme.
I have got gold for the LSAT and MK48. I am now working on the QBB LSW. For me it is the best LMG.
A lot of people knock the Lsw but I've love it, all the benefits of an LMG with reasonably fast reloading means that when the smg boys have run out of bullets you can just keeping on going. I got it gold and all the challenges without really trying that hard.
Some people love the Lsat but I'm finding it more difficult.
The QBB is a good gun, its not great at long range but thats what the MK48 is for.
I disagree about the range. While playing Drone I cleaned the snipers out of the backof the map and fliped the spawn. I then set up shop and was able to snipe the helicopter pad with a regular sight.
I am about to get this one gold for the diamond lmgs. not looking forward to it.