Terringzean has a combination of REALLY GOOD turret mounts, even better missile mounts, high armor, a comprehensive PD grid, and Burn Drive.
You essentially wreck face with it but it's a Heavy Battleship, in the hands of a skilled captain it's supposed to do that. Haven't tested it on Tesseracts but the combination of 2x Reaper Launchers, the Hephaestus cannons, and some S-mods makes it a fleet-killer. You point it at the enemy, Burn Drive into point blank range, unleash Reapers while turning on your shields to avoid blast damage, orient yourself at the next enemy cluster, and repeat until everything is dead.
It's not nearly as good in AI hands due to the AI being marginally less suicidal but it will still wreck face.
Also I like the Atticus but would also like to see it a bit more? Feels like 'my faction' was the only one that used it in the last playthrough.