I've generally been quite happy with my legion XIV ships, and I think they are worth going after with the aforementioned possible exception of the falcon, since that ship is more reliant on speed, and well, the pirate variant tends to be better anyway in my opinion.
The key is to just go all in on armor for them, and throw on heavy armor and possibly even armored weapon mounts as well, to try and crank it as high as possible. Since more armor means it has both more resistance, and that resistance lasts longer, it has a really strong positive self synergy.
They ultimately have a somewhat different role that shifts them a bit more from the hammer side of things to the anvil. You push the enemies in toward them and let them work from there. Its not a universal upgrade, but it doesn't need to be.
Also the special paint job is awesome, can't forget that.