It really depends on the people you are facing. If you have good aim with M+K (and good map/game knowledge) you can still shit on a majority of controller players even with their aim assist handicap. Also aim assist doesn’t have the same strength in every game, example in Halo 4 the Light Rifle is incredibly powerful for M+K because of aiming mechanisms; controller players have a weaker-than-usual aim assist for the zoomed shots, making it much harder to use for them.

But I’m digressing - when you face a skilled player on controller, it fucking sucks. I can’t really explain it well, but from the vets/pros/just skilled controller players I faced in MCC, it’s like playing against an aimbot and it puts a lot more pressure on your performance whenever you get into a 1v1 against them. Also the Battle Rifle is like the worst offender for aim assist mechanics and it shows for those type of players. It’s kind of why I just stick to Reach and 4 because aim assist isnt as dominating compared to how it is in 2 and 3.