Excellent idea, we could use this forum to list the names of all those that complain, bad mouth others, but when the time comes to prove their ability they whimper away and disappear.
We all know a few examples over the years:
1. There was one that enter alpha lock but didn't know how to get out of it.
2. Squawk 7500 for passenger not getting off the aircraft.
3. Demanding the tower to allow him to land on RWY 34 when the wind component would exceed the 10 kts limitation, even against the F/O wishes.
These same Captains also have a dedicate group of admiring F/O who look up to them and hope to be like them when they become Captains......not.