Myatovic has been bad and should be in Juniors, which I've said from the first few games of the season.
Gaucher has been playing well outside of offensive production, but is also playing a pretty specific shutdown role on the Gulls this season. He's never putting up huge point totals in the AHL (granted you want to see more then 1 point from him).
Warren has had a solid season to date for a rookie defenceman, and is our best hope of having another top 4 RHD (outside of Luneau).
Your point on Gaucher is valid, however it's still quite concerning that he's failing to produce at all right now. Even a borderline NHL talent (which Gaucher should at least be close to by now) ought to be able to put up middle six type numbers in the AHL, historically speaking.
He's never going to be an offensive guy, but a forward with NHL tools and a year in the AHL already under his belt - should be pacing for around 30-40 points at minimum, or the alarm bells start to ring.
It's still fairly early, hopefully he can string some points together here soon. I hated that we didn't get anything higher ceiling out of that trade at the time and still despise it though.