I just hit rear admiral, got a sweet assault cruiser, and turned it into an evil torp-slinging beast. Two interesting things I've noticed about ST:O recently:
1.) Replaying the Klingon War arc missions seems to give better rewards than everything but STFs at max level. One in particular, the end of the arc, called "Past Imperfect," gives you a choice of a shield with massive capacity (probably ~20% more than a covariant [cap x2]) or some plasma-disruptor hybrid beam arrays or heavy cannons, which deal more damage than very rare quality weapons and have the procs of both plasma and disruptor weapons.
2.) Ground missions are cake when you're an engineer with orbital strike (still wondering how it works inside buildings, though) and an entire ground team with miniguns and with abilities that construct quantum mortars.