I absolutely love the D'deridex design, I always have. And I'm very happy that Cryptic has finally given me the chance to fly one. Nor do I regret any of the money I put down for the Legacy Pack. That being said...
Going from the highly maneuverable, Tac heavy T3 Mogai/Valdore to the T4 Eng focused, turns like it's stuck in molasses D'deridex/D'ridthau is one of the most bizarre player experiences in the game.
Don't get me wrong. The big D'd is very playable, provided you're willing to spend every skill point you can in core efficiency, thrusters, and engine performance, slap at least one RCS console on her, purchase the Helmsman space trait from the exchange for 16+ million EC, not use any singularity core abilities in combat so you're getting the full benefit of the excess power to subsystems, and make judicious use of the battle cloak...
My experience has taught me that the D'deridex is a beautiful, but very high maintenance lady.
I'm was so happy to get the D'deridex in the game. I am equally sad that it's such a chore to fly. With the low base turn rate, it's dreadful to get any respectable maneuvering out of the ship.
When XP earnings during a Double-XP Weekend still feel like I'm underperforming,
there's something terribly wrong with the reward system...
You can find/contact me in game as @PatricianVetinari. RIP Terry Pratchett. Original Join Date: Feb 2010.
Doing everything I outlined above, currently I'm getting a turn rate of 11.2 out of combat, and over 20 when in battle cloak thanks to the Romulan cloaking mechanics. So you can turn the D'd from a pregnant space whale into one with a decent for a cruiser turn rate, but it does take a lot of effort, patience, and EC to do so.
Infinite possibilities have implications that could not be completely understood if you turned this entire universe into a giant supercomputer.
Going from the Mogai (turn rate 14) to the D'dex (turn rate 5.5) is a bit of a shock as you have to change boffs, weapon types and tactics. Not saying it can't be done, I enjoyed using it with my engineer, but we really need another free "escorty" ship for T4 so those that want to avoid the whale can do so without paying for an ally cstore ship. As it is now it muddles the romulan experience a bit.