Rainbow 6 Siege
Sure the balancing & bugs were improved over first couple of years but since then they ruined most maps character by re-working them, always nerfing ops but then overly buffing shields, started introducing dumb new ops nowhere near reality, moved from realistic cosmetics to ridiculous cartoons.
If they had of stuck far closer to the realism aspect & not pushed for so many ops & cosmetics it would have far more identity.