Diablo 3 - Previews @ IGN, 1Up

IGN and 1Up both have hands-on previews with Diablo 3 from GamesCom.  IGN's intro from their time with the Witch Doctor class:

Even though Diablo III is presumably over a year away from a release date, this game absolutely oozes polish. It runs at a silky smooth framerate (at least on the PCs Blizzard brought to Gamescom), the animations of your characters and magical effects and the deaths of enemies are smooth, detailed, and full of character, and the combat gives you a great sense of weight and impact. This was my first time getting to actually play Diablo III, and as a big fan of the previous games, it was very much along the lines of what I was hoping for.

...and 1Up, who chose a Wizard:

As you'd expect, a variety of demons and creatures came out of the sand to attack me. Some, such as the Lacuni Warrior and Fallen Overseer, had a fairly traditional demonic look with a hunched over posture and flaming swords in each hand. Others were desert creatures, like the Sand Wasp that flittered around a little ways off while launching volleys of baby wasps at me. One of the more dramatic opponents was the Dune Dervish; it twirled and spun around, and used those spins to produce a vicious stun attack with a knockback effect.

All this action looked familiarly enough like Diablo, but with all the polish of a modern game. Liberal use of special effects made a big impact on the presentation; the screen warped with the impact of spells and became obscured from dust swirling around the Dervish. And through it all, the unmistakable art style left no doubt what game I was playing.