I'm actually enjoying DCUO more than CO atm, due to it's elements, such as crowd control and stuns, they actually seem to work in the game on most enemies(and even work on enemies they don't always work, when you learn the combat a little). In DCUO I find it very fun when I can lock down 4-5 guys at once in a situation where i'd otherwise get overwhelmed with my quantum controller, and then destroy them promptly. While in CO, an equivilent threat of henchmen never happens for me(simply cause they do pitifully low damage), but even if they did holds in that game don't even last longer than a couple seconds due to damage, if they don't break instantly from your own damage or someone elses. And stuns just only hit one guy at the most, 90% of the time, and don't even last 3-4 seconds nore work on the enemies you'd want them to work on, while in DCUO I'm finding alot of bosses are actually stunnable in the game, including guys like aquaman for example.
Some tips for combat; enemies that lunge alot or use melee combo's, block them and you're guaranteed to stun them, you can then follow up with other cc abilities to further lock and chain-lock them. If they block, use a charged up ranged attack or a heavier ranged combo and you'll stun them. If they use a heavier ranged attack alot try using the melee lunge on them. The game tends to be rock/paper/scissors, admittedly I can't give advice if someones reflexes seems poor but the AI tends to develop habits you can exploit through anticipation so far.
What I cannot stand about DCUO, and i feel the same way about CO though, is the holy trinity, especially since it's more apparent in DCUO compared to CO. CO only gets around it due to the freeform system, but the archtypes pretty much are pidgin holed into only doing one thing, and they don't often do that one thing well either. People often complain about it somewhat in the forums of DCUO regarding controllers and how they are treated as just energy batteries that do nothing else but "heal the energy bar", just the same as defenders complained how people treated them in CoX as "doing nothing but healing the health bar" even though they did so much more. Controllers do alot more than heal the energy bar, honestly DCUO could break the holy trinity if they'd just add better damage mitigating options and overhaul the healer role into something more interesting than just a heal bot.