I've been playing RTS games for a long time (eg. Dune 2, C&C Series, Company of Heroes, Warcraft series, Age or Empires series, etc), and so far this is the only RTS game I can think of that finally makes fighting the battles more important than managing the infrastructure (ie. economy and base placement) and does it well.
In most other RTS games, you always had to worry about hitting certain key milestones within a certain amount of time. The build order and the efficiency in executing that build order almost always was more crucial in determing the victor in multi-player than the management of your combat units. Personally, I've always hated this aspect of most RTS games, because the games were usally decided within the first 2 minutes of the match and team work was almost always a non-factor.
With World in Conflict, there is essentially no more resources gathering. Instead you get "resupply" points that regenerate over time, so micromanagement of your units is much more vital. In addition, since the resupply points are the same for everyone and the points are limited, rushing and spamming units are almost impossible to pull off without adequate teamwork (assuming you are playing more than 2v2).
I've only been playing the game for about 1 week now, and I can't honestly remember a game that is as balanced and polished as this game. I'm sure that part of this, is that the game is so new that no one has figured out the best exploits, but so far I haven't seen any single player dominating excessively.
I should also mention that the game looks damn "pretty". I've never seen a tactical nuke rendered in real-time look so good!
The demo is still available out there and definitely worth a try.