CSE is the easiest space stf. Its also the easiest to turn into a bloody nightmare.
Ive done CSEs on my eng (in his escort so only doing about 6-8k dps) with a relatively useless d'kyr in the group (probably the lowest dps ship, ever ...) and we burned through it less than 5 minutes. This is functionally 4-manning it.
Then you hop in the queue and youre lucky if the other players can kill even a single bop before they get to the kang.
very difficult, but not impossible. i have won it easily several times, but as someone else stated, it can be a bloody nightmare.
i started focusing on kang exclusively and my win rate is better. i'm not a super player or have the best ship in the world. i just "protect" kang.
This is pretty much what I've started doing. No one ever seems to give a crap about defense, so I'm left handling it on my own most of the time; when I have a second player doing defense with me, I *know* we're going to win, albeit probably slowly, since everyone insists on popping one of the cubes before the probes are dead on the others. I run a bulldozer (gravity well, repulsors, tractor beam, chroniton torpedoes + spread 2/3, and web), and it's given me a better chance of success than anything else I own for this very reason.
IMO, the main problem is that Cryptic never scaled Kang's HP/Shields properly. If I recall, kang has about 900,000 HP on elite, yet the borg ships can burn through its shields and HP in about 5 seconds of sustained fire.