Recs.
Updated
SpecsUpdate
Pros
Pro Strategic scale
The biggest maps are 81 km across. Ground units can take time on the order of tens of minutes to cross this distance, and even aircraft sometimes can't get places fast enough. If your scouts see an army coming, you have time to prepare. Artillery plus radar can hit things at long distance. It feels more strategic and less tactical than other RTS games.
Pro Massive battles with plenty of outcomes
Battles can involve hundreds of units. This allows for even experimental units that can single-handedly take out entire armies due to their sheer size. This way there is room for experimentation in what can works, or just to see what outcomes they have.
Cons
Con Long learning curve
This game takes a while to pick up and learn to play well and since everything happens slowly you need to plan.
Con Developers abandoned the game
However there is great community support in which they have released patches in order to fix outstanding bugs as well as support hosting a map vault where players can download community made maps to use in the game. There is also a matchmaking lobby tool available here, which makes finding online matches to play pretty easy.