It seems fairly solid. The dynamic campaign has a rushed feel to it and it doesn't explain itself well, but it plays fine. The dynamic campaign is so different than the campaign in W:EE that it threw me off a little. I think future patches will clean it up a little better, but the gameplay is well beyond that of W:EE, in my limited experience playing both games. Fixed-wing aircraft add a much necessary dynamic to the game.
Mainly, most people have issue with the 20 minute-per-campaign-battle time limit, the omniscient AI (which is my biggest issue, since something that is omniscient isn't really AI is it?), and the lack of being able to play any amount of players on smaller maps. Some people still mention balance issues, but I think that is an on-going issue in any RTS or strategy game.
I would personally like to see them make a more open-ended campaign (there are current 4 choices, based on length, difficulty, and starting nation) to make it feel more like the Total War campaigns. As it stands, the original (easy) campaign is quite linear and scripted. Apparently it opens up though and options become wider and more dynamic.
Overall, the single player campaign is rushed, but solid. Multiplayer has minor balancing issues, but it is the same deep Wargame, apparently. Aircraft and the added units make decks more interesting and the potential of variation nearly limitless. Some more campaign polish and redone/improved AI could make it one of the better RTS available on the market.