The disparity between normal players and cheats is wild.
Normal players: 20-40 kills, 2:1 KDR-ish, some better, some worse.
Cheats: 30+ kills in CQ, 60-80 other modes, 4:1 min KDR, usually wildly better.
What I usually see: CQ maps is a level 40-100 player wiping everyone out. I generally just assume this is a bought account from someplace like G2G or sale account someone picked up cheap as a throwaway after a prior ban. Almost always the same play style using an SMG or other meta gun with zero recoil and zero misses, often a shotgun with 100% headshots.
Big maps: Usually a helo that sees all and never misses, otherwise it's the usual stuff... players with consistent headshots, accuracy at with full auto at ranges that never should be possible, and always seem to know where you are.
And then if you look up an account (if it isn't blocked or un-findable due to weird characters in the name) it's a level 900 with 10,000 hours in game because it's being farmed.
Anyway, it's apparent EA doesn't care about cheats, and their anti-cheat is fairly arbitrary and useless. One good look at leaderboards shows players with impossible accuracy and insane KDR that simply aren't humanly possible. Yet there they are.
EDIT: From EA itself: "if a player is consistently reported over a long period yet never triggers other anti-cheat signals and repeatedly passes manual review, MIR will recognize them for what they are: a skilled Battlefield veteran."
So basically people that spam report skilled players water down the cheat detection, but a cheater that passes whatever "manual review" there is will be allowed to continue to cheat unless they do something completely stupid. I'm sure that "manual review" by some overworked and uncaring employee is deep and thorough. /s