Mistakes were made by a few of us about the Meson Spinals, but it is clear that one gunner with one screen CAN stop one spinal mount, although they'd need to be lucky vs the biggest ones, or be using several screens. And if they flub their angle screens roll, the ship is always in trouble.
That seems fair.
A further observation, which is the sort of thing that will need to be looked at for any future capital ship rules, is that each smaller Meson weapon needs the same defence. At least one gunner and one screen.
Those are likely to be defeated, and don't hurt a big ship anywhere near as much, but a Tigress only carries 7 meson screens. It would seem to be vulnerable to a group of meson cruisers. The eighth or more attack in a salvo is going to strike unopposed in the rules as written, unless I'm missing something.
But maybe that's as intended. Part of the interplay of fleet combat and the strategy of squadron design?