Crud...now that I've typed all of this and re-read it, it's too long for most, and I apologize. If you're still in the JOPA...feel free to take a pass. Work on the war fighting skills first and foremost. If you're in or en route to DH or XO/CO, you might find it interesting. If you're post-CO...your own well-formed views and opinions probably count more than my own.
I think all of the services genuinely try to use "best predictors" of essential operational leadership as best they can in the senior leadership selection process. As Spekkio said, the metrics are just so damned "fuzzy" short of the crucible of truly hard times, which is the only laboratory in which the Nimitzs, Halseys, Pattons, Eisenhowers, and Spruances boil to the top...by succeeding. Many are called (promoted); few are "chosen" (succeed). If anything good can be said about GO/FO "bloat" in today's services, it's that we have a full bull pen of folks who are ready to take the mound when someone else gets benched. Sort of George Marshall's mode...
As I said before, the Navy (IMHO) has had it "fuzziest". Honestly, we just haven't had too much by way of "truly hard times" in our domain...for a long time. Good for us...I frankly hope that doesn't change anytime soon. But absent near-peer competition in our domain, we've become "capability providers" to support others who have it harder (on the ground, usually, but often to the JFACC). We're tasked to provide, we provide...and no shame in that. Wardroom food's good (by and large)...etc.
I know many of us on AW have worked for and flown with a bunch of great Naval Aviation (or other community) leaders whom we would have followed anywhere (both on liberty and in combat). We can all rattle off 5 or 6 without breaking a sweat...and most never got beyond 2-stars, if that far. Why? Because, to some extent, they spent their lives being the best...and wanting only to LEAD the best... in the operational environment: squadron CO, CAG, deep-draft and CV(N) CO, CSG Commander...you get the idea.
The major command pipeline is key (a filter?) to be sure, but sometimes it's just a short "ticket punch" to get the guy or gal back to the Pentagon with that in their bio. Some really then "earned their bones" in what, in peacetime, is considered by many to be the most important "hostile environment": inside the beltway. We all like better/more aircraft/ships, more flight time/steaming hours, better training ranges, better ordnance...you name it. Those hard battles were fought within the confines of the DC environment, and it takes a different mindset to succeed there. They didn't any of them "suck"...they just got told to fight different battles. But that gets rewarded as well. Sometimes TOO well, since they are now adjudged to be "best qualified" to come back and do it again in a position of higher authority. Sort of a self-licking ice cream cone, I guess.
Not saying any individual mentioned in this thread (GEN Ham or RDML Gaouette) pertains to ANY of this at all...we've just sort of spun off in this direction. I, for one, would LOVE to find out that both were relieved for "hatching and prepping and almost launching" a rescue/relief plan for Benghazi that was not approved by higher authority. I doubt that's the case...but it would be glorious.