Do NOT buy this game from Steam. You can't run Combine Ops with mods with the Steam version (Steam issue, Bohemia can't do anything about it really) If you want to go digital download go for the Sprocket Version
which is not much more expensive, but has no DRM, can use mods and most of the money goes straight to the devs. Much better idea.
On whether you should get it, the controls you do, eventually, get used to. There are lots of AI mods (Zeus AI being my favourite) which to at least some extent deal with the AI. The multiplayer is very strong and definitely worth the purchase, but there are lots of custom single player missions which really add to the lifespan of the single player. It took me a long time to make my mind, I'm glad I bought it.
Main PC: Phenom II X6 1055T @2.8GHz, 8GB DDR3 Dual-Channel 1333MHz RAM, 1GB HD 5870, Win 7 64bit Home
Laptop: i5 540m @2.53GHz, 4GB DDR3 Dual-Channel 1066MHz RAM, 1GB HD 5650m, Win 7 64bit Home
In Arduis Fidelis