Siegfried is still a monster, brother. Don't count it out completely just because the secondaries aren't laser-guided like they were at one point.
Agir and Siegfried still have more-accurate-than-normal secondaries :)
Generally I feel like getting the T10 ships first is the right choice due to their value for competitive modes like Ranked, CB's, and King of the Sea - but Siegfried is up there in my list of favorite ships :)
I also wish their secondaries were Napoli-level, but it's hardly fair to say that the boats are trash =D
See - Supercruisers are my absolute favorite style of ship in the game. I like that they can outmuscle other cruisers and can even go toe-to-toe with some BB's if you're a skilled player.
Most Supercruisers tend to have a very nice niche for themselves as well. Napoli is a deceptively well-armored and fast cruiser that gets in close and "traps" something with it's secondaries and torpedoes. Siegfried and Agir have very strong upper hull plating and very strong AP shells. Alaska is an absolute monster in a variety of ways with the advanced AP pen angles and radar, while the Carnot is this gigantic speedy HE-slinger.
Lots of fun, the Supers :)
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