A good shooter depends on the context of what the firearm is used for. We have all the mindset, situational awareness, knowledge of relevant law, etc. Now as far as speed/accuracy standards there are lots out there. Greg Ellifritz, Tom Givens, Karl Rehn, etc. have published extensive analyses of such.
I will offer this from Claude Werner - great practical teacher (great snubby class). It's a little different take: https://thetacticalprofessor.net/202...dgun-shooting/
Basically don't do this - The Top 5 Missed Shots in Handgun Shooting
The first shot.
The last shot.
The first shot after reducing a stoppage (which includes a reload).
The shot after an Unintentional Discharge (it’s missed because it’s not fired).
The first shot after the transition to another target.
More analysis in the piece. About number three - I did a classic. Fired one shot - went to slide lock and reloaded. Forgot to re-engage for the second shot. I swore in my mind I did but I didn't. Saying you don't go to slide lock isn't for DA STREETZ.