I have just watched a video fom Matimio which he made during the event and to me it seems like there were quite a few times he decided not to engage the enemy at more then low range. rather he used cover to move in closer and get the kill. recoil on the smgs looks reasonable and in addition the dps drops segnificantly after about 40meters. Close range of course, your a god with the smg.
Heres the video:
pay attention to moments like 00:48 or 01:26;. He Spots the target (even thou they are not that far away), then procedes to get in close and take them out. At 02:24 he even starts shooting at mid-range and needs to use the granade to finish of the target because he burned through his magazine on that one target alone.
Excuse my bad english but I really hope you will get my point here.