Great game. It definately deserves more credit than it gets. Features great action packed gameplay, a good match making system (you can choose a server with players at your level) and a variety of fun gamemodes. (some team based and others solo competitions) I find the Invasion pack particularly fun too.
Verdict: Great game for people that like a fast paced, adrenaline pumping shooter. Variety of fun online gamemodes, and map editing tools allows players to create and share maps and other things such as character skins, map packs and more. Also i like the parkour style gameplay too.
What Needs to be Improved: It would be nice to see a single player campaign and character customization. Also it would nice to see a greater variety of weapons and to be able to see the weapon in the corner of the screen like in games like COD. (after all it is an FPS)