On paper, Warhammer 40,000: Dawn of War II: Retribution sounds like the perfect package. It's a standalone game, which means you won't need to own the original game or its first expansion, Chaos Rising , to get in on the fun.
Imperial Guard is a great new faction; Regular units now available in campaign; Steamworks replaces Games for Windows Live
Campaign story is below average for Relic; Mission design lags behind competition; No replayability outside of multiplayer