Completely satisfied with my Fleet Sovereign.
She is a real powerhouse now.
Was battling a Avenger on release day in a 1v1 and beat her the first round. I lost in the second round, cause the guy figured out how to use the new cruiser commands to better effect, which I don't have yet. Once those come into play for all cruisers, that disadvantage goes away.
Avenger is a good ship, but not overpowered to the point where you have to fly her.