To start: the 16" Ds were not the intended setup - they were always supposed to be more of a "fun" one. And complaining about a second viable setup, when many ships don't have one, makes you look petulant. With the 14", Fuso is actually one of the best BB2s, most of which are actually solid ships that can easily dismember any BB6 that blunders into their range. The Ise is intended as an inferior Fuso that gets you the CV remod.
Frankly, most valid criticisms of the Fuso/Ise apply just as much to any other BB2, and reflect more about the state of the game than the ship itself. ANY BB2 is likely to have trouble in GB, especially at level. They can only pick off smaller ships and maybe get lucky enough for a bigger one to blunder into their range.
As to the Nagato, it's again a common issue seen across nations. Most BB3s are inferior to the BB2s they supplant in either speed, firepower, or both. They instead get range, which is a big deal, and that tier is a good time to hammer that fact home. Yes, the Nagato is less likely to sink anything than the Fuso, but it IS more likely to get SOME attack against larger ships. It's a very different ship that supports a very different playstyle, but is still a perfectly serviceable ship with its own role, especially with its armor piercing HE shells. Would I rate it among the weaker BB3s? Maybe, but I'd still rate it above the Strasbourg, Caracciolo, and Hood.
As before, most of the valid criticism of the Nagato holds for most BB3s, and is more about a game state where they're thrust in battle against 5.5s and 6s without a chance to shine or even show how they compare to each other. You'll tend to find the same issues in most nations at the BB1-3 tiers.