From a raiding perspective, I've done 4/5 nightmare in EV and 3 out of 5 in Kragg before I quit. We achieved this in two raids, and I know guilds cleared everything but the last boss in EV on nightmare mode(due to bugs) the first day it released. So from my experience the raiding content is incredibly weak at the moment, if you compare it to wow at least. Then again, the game is new, there are no combat logs or whatever and these are the "entry" raids, so they aren't supposed to rock the planet. They have the potential to make stuff a lot more challenging than just slapping on more hp and adding a faster enrage timer, need to see how it develops. As things stand I rate it very easy, because nothing really requires much execution, its more trial and error on your dps.