Inspired by a number of different strategy games, ADoE combines elements of turn-based strategy with fast-paced tactical combat.
While there are similar Flash games out there, I think ADoE manages to innovate with a bit more strategic depth. This of course comes at the cost of somewhat greater complexity, but it shouldn't be too difficult to pick up. It stands out graphically too in my opinion, using plenty of pre-rendered 3D instead of vector graphics. It does require a decent computer to run well though, especially in late game when armies get pretty big.