My score and hit percentage have dropped 50% since 2.24 came out.
Are you speaking about fighters?
There was no change in AH that should have any influence on your ability to hit stuff. Reduced hit% can result from many things, from having just a bad streak, to different targets (for example less buffs than usual), accidental change on joystick settings (deadband, scaling, dampening -has once happened to me after we got a new version).
What's your ingame handle?