Champions Online, all the skills are pretty nice, you don't have to stand still while using them - you have to block like an action game and you can fly while doing pretty much anything. Some also have like different firing modes e.g. one called Force Explosion, you can tap it consistently to deal aoe damage to everyone around you every tap or you can charge it up by holding down the key to knockback and deal bonus damage. You can also change your controls to an FPS type, making you aim all your spells at whatever your crosshair is on, which is also quite interesting.
Seconding this, Champions Online actually lets you do some cool stuff with casting, like holding a button down to charge spells, or tapping it to quickly release smaller blasts... some spells are more like continous beams and will simply continue firing until you stop them... pretty cool shit actually.
There is no unique MMO is because WoW owns the market just as if there was a FPS that owned the markets there would be no unique FPS. Its just due to the fact that MMOs are still a very new thing and only been around about 10 years and started crowding around the WoW market since about 2005. Hey everyone wants to prey on the WoW market of 14 million so thats one reason why you might say:
There is no such thing as "unique MMO"
So EVE Online isn't unique? Wurm Online isn't unique? Haven & Hearth isn't unique? Jesus christ man, know what the fuck you're talking about before you bold and underline it.