I'm forever told by people that I'm playing with that Cruisers are practically redundant after Cryptic released a patch some time back. If this is true, then it is unfortunate for me as I chose to have an Engineering Career.
My Tier #5 ship is the Assault Cruiser (Noble w/ Majestic neck w/ Sovereign Hull to be specific). I'm currently running her with x4 Polarized Tetryon Beams (x2 Fore, x2 Aft), x2 Quantum Torpedo Launchers (one each, Fore & Aft), a Dual Polaron Beam along with some Transphasic Mines.
All weapons are Blue/Rare with the exception of the torpedoes which are standard, and the beam banks Purple/Very Rare. All weapons are Mk XI with the exception of the torpedo launchers and dual beam bank, which is Mk X.
My Boff skills are:
Tac #1 Fire At Will & High Yield Torpedo
Tac #2 Tactical Team
Eng #1 Emergency Power to Shields, Engineering Team, Extend Shields & Aceton Beam
Eng #2 Emergency Power to Engines, Reverse Shield Polarity & Directed Energy Modulation
Sci #1 Polarize Hull & Energy Syphon
Sci (alternate) # Jam Sensors & Tachyon Beam
also you chose your career to be a tank/supporter and not a DD. So you must layout your abilities in this fashion.
Go for 1 energy type only...don't mix them. and use all tactical consoles to boost this energy weapon type.
Then you can go for elite STF's and grind all borg set and if you are lucky a MACO shield.
And when you feel to be able to tank, get a torp spread 2 insted of high yield.