Ok let me try this one.
I've flown with 300 hr FOs and I've flown with 12,000 hr captains. I've hit pretty much everything in between.
As far as technical flying skills, I saw good and bad pilots at both levels. The difference is that the 300hr pilots were willing to listen to "the old hack" and take some advice. For the most part the high time "bad" pilots were not interested in my opinion. They had learned bad habits and wanted to keep them!
Here's an example. In transport category aircraft, you frequently try to stay at altitude as long as possible, for many reasons, such as smooth air, fuel consumption, visibility, etc.
As a result, there is a maneuver which I call the "chop and drop." All of you have been in airliners before and probably experienced the sudden, weightless inducing maneuver that many pilots use to leave altitude.
In a 737 with autothrottles, for example, the easiest way to do this is to hit VS and flip the selector right to 2000fpm down.
I am not in favor of this maneuver in any aircraft. It practically puts the passengers on the ceiling. It certainly brings it to their attention that they are flying. My goal is a smooth flight that never brings it to the attention of the passengers that any maneuvers are being executed.
It is much more comfortable to slowly bring the throttles (power levers, thrust levers, insert PC title here) back to idle and let the nose drop gradually.
In the 737 I would dial in 200fpm first, then 300, then 500, then 700 etc. The throttles would inch back and I would be at a 2000fpm descent in about 15 seconds as opposed to instantly.
Much more comfortable and much less noticable.
Low time pilots were willing to listen. The high timers who "chopped and dropped" just plain didn't care.
OK now this is all about technical skills. As far as judgement, experience with weather, and "flying savvy" then it's a completely different story. I would rather fly with the 12,000 hr guy any day. They may bounce me around but they have a history of making it home safely and in one piece.
They were also 100% better on the radio.
Sorry about the long post.