PC Zone offers their own review of Mythic's recently released Warhammer Online: Age of Reckoning, giving it a 9.2.
The careers fit reasonably comfortably into the usual class roles, with a few notable differences. Careers are less dependent on the usual pool of mana or energy, and each has a special mechanic they depend on to do the most damage. While abilities use action points, they generally depend on some other source to do the most damage.
For example, the Black Orc, as he uses different attacks, moves towards 'Da Best Plan,' a state that lets him unleash his most damaging attacks. The Bright Wizard builds combustion with each attack, doing more powerful and frequent critical hits, but also damaging himself in the process. There's a degree of micromanagement that requires you to be a little more alert than the average thumping of keys. It's not rocket science, neither is it really doing much to advance the basic mechanics of MMO combat, but it's satisfying, playable, and most importantly it works.