I haven't really noticed SBMM as much in this game as I usually put my poorer performances down to not finding many people on the larger maps, getting screwed over by the shitty netcode,having a mare against users with 725's or ones that just play dirty. It's definitely there especially in FFA but I don't think it's as prominent as it was in games like Advanced Warfare. Ideally I would like SBMM removed from all COD games and have it purely connection-based like it was back in the old days. There's just too many algorithms in play now plus lag comp can be a bitch too. Black Ops 2 started this and things have never been the same since although it's got worse since they moved to away from P2P to dedi/listen servers. At least BO2 did factor in connection as a primary but SBMM seems to take priority these days in COD games.
When the Battle Pass element is released in December, I'm expecting standard users to be heavily matched with sweaty premium stream players, so I envisage the SBMM aspect to get even more noticeable also. In a months time, this game could be a very different experience and not for the better either.