
The combat, for the most part, works well. On PC, melee and ranged attacks are controlled with clicks (Square and Triangle on the PS3), and combinations of taps and holds of the mouse can result in different moves once you've learned them. It's super-simple and easy to pick up, although it sometimes feels like the difference in damage between combos is negligible. You do get a sense of satisfaction when you manage to juggle an enemy long enough to kill them without taking any damage, and attacks are surprisingly responsive given usual MMO latencies.

As you level up, you gain Powers which vary in effect and depend wholly on what superpower you chose at the start of the game. Some powers work well together and some work well in combination with your attacks, but there are some powers that you only keep around because you needed them to unlock something better. The power trees could use some streamlining, and given that many of the classes have similar abilities, the classes could use some powers that define them. As it stands now, few skills feel truly unique to the classes, which makes your role in group combat feel disposable.
If you are new to the MMO genre, you may not be familiar with the "holy trinity" of the tank, healer and damage dealer that forms the core of most mainstream MMO group combat mechanics. Until an alternate mode is unlocked at level 10, regardless of what power set you've chosen, you are considered a damage dealer. For the most part, when you're playing solo, you'll want to stick to damage mode. In a group, you'll find everyone benefits if a few switch to their alternate mode. Unfortunately, DC Universe doesn't explain what purpose your other modes serve in groups very well. That's fine, I can't think of a game that does explain that well. Far worse, DCUO doesn't explain how to switch roles, and I found myself in groups with people who assumed that queuing themselves as a healer would automatically switch them to one (it doesn't).
The setting for these quests is typically either Metropolis or Gotham. Both cities are wonderfully fleshed out and rarely have repeated structures. There are a lot of recognizable locations, although as someone without a deep knowledge of DC, I'm sure I missed out on a lot of the references. With no day/night cycle, Metropolis is perpetually sunny while Gotham is forever shrouded in darkness. Despite both being urban settings, neither gets too tiresome thanks to the art design and the way the cities are almost divided up into segments within themselves.

I wish I loved DC Universe Online, but instead I just like it. It's got a lot going for it -- a great license, some superb voice actors, a lot of well-crafted settings, fast action-based combat, and an entire market of people who, so far, have barely been exposed to the MMO genre. It's an important game for MMO developers who for years have been claiming that their title will be multiplatform, only to let that claim sink quietly into obscurity in the months after it is released on the PC. The fact that Sony Online Entertainment has launched an MMO on the PS3, especially in unison with the PC version, is impressive. DCUO is far from a bad game; there are indeed times when it shines fantastically with the potential for greatness, but its many faults, most minor but some quite large, ensure that it never reaches those heights.