Well If I wouldn't have second guesses any of my CAs we would have:
-Landed on the wrong runway
-Entered a hold at the wrong FIX
-Turned onto wrong taxi ways
-Used the WRONG T/O Weight Cards
-Climbed instead of descended
-Blown through 10K at 280kts+
-Stalled the A/C on Approach
-Turned the wrong way after Canarsie VOR on the Kennedy1 Canarsie Climb.
..and many more I cant think of.
But I guarantee you that the CAs thanked me every time. I find the "newer" upgrades having the biggest EGOs and dont take kindly to the FO proving them wrong. The More Experienced captains generally are humble ,respect your opinion, and are very pleasant to fly a whole bid with.
True enough... but there's a spread.
-Newbies (captains) can be a pain, ego is huge.
-Semi-new - not bad, getting intothe groove
-Mid-way through the career - fun!!!
-Older but not the oldest (maybe 15 years from retirement - PAIN IN THE A$$ they are old enough to have experience and think that they are now g-d's gift
-Oldest (near retirement) - well, they go to bed early but they're fun to fly with and are usually easy going
All that being said, all have exceptions. Some are VERy set in their ways and can't imagine themselves ever being wrong, others are very easy-going, open to professionally given suggestions.
if you're in a 2-crew environment, act like it, learn something, you're not invincible and your FO is there for a reason. Remember, almost EVERY reg written is reactionary - someone did something that wound up being stupid and now there's a reg for it.
Captains have caught many a mistake I've made and you bet your @SS I've caught a crap-load of theirs, in one case I was just a jump-seater
(Captain tried to enter the runway for t/o at a mid-point taxiway intersection instead of full-length, f/o said nothing... I tapped him on the back at the same time tower called him out)