Personally, I've always preferred Objective over Slayer and yet I've always been in the minority. Feels bad. Going all the way back to Halo 2, Slayer has been exponentially more preferred than Obj and pretty much every Obj-centric playlist eventually died on the vine.
That said, I am excited for Match Composer functionality to come to Infinite so we can just choose to only search for Objective modes if we desire (just hope enough other people feel inclined to do the same!).