An addictive game. Online multiplayer is good, yet the campaign although not bad is not exceptional either.
Firstly I always begin by playing the solo campaign before I battle it out against the worlds finest online. The solo campaign is good but not too good either, it is a reasonable length and the missions are generally short and on small maps.
Online I am currently at level 30, with a Trueskill rating of 25. The Trueskill rating informs you and others how good you truely are at the game, how often you win - having a Trueskill above 20 means the player is quite good with a decent strategy with a specialised race (Of which there are Orcs, Humans, Tyranids, Eldar, Chaos).
The nice online feature is that you can paint your own army any colour you want to mix and change things up a little when you get bored of a certain appearance.
Conclusion:
Good:
-Great heroes (Chaos Lord)
-Great environments with detail
-Online is decent
-Online features
-Each race has advantages and disadvantages
Bad:
-Solo campaign missions a bit short
-Save game sketchy (once you die you have to restart the mission - this happened to me)
-Limited units with some races