We have all flown with dodgy crew, be they on the left or right.....had to wipe your partners backside in various situations.
That said, I guess what the real issue is what makes a good competant safe pilot....I don't know......still trying to learn that.
What I do regret is never having flown piston twins...does that make me a worse pilot? Not sure, but from the guys I respect, does feel like a missed out on an opporrunity to learn a heck load.......