[MetalMilitia]

Half-Life 2: Deathmatch.

This game never got the recognition it deserved. It's really fast, skillful and strategic.
I mean people say it takes skill to be good at UT or CS, which is true but at the end o fthe day you're still just pointing on the enemy and clicking. In HL2DM you actually have to consider exactly which weapon or object is best suited for the situation. So in a matter of seconds you need to look around you check for suitable grav gun objects (sinks, toilets and radiators are preferential) if none are in range switch to your best weapon for the range at which the enemy is at while simultaneously avoiding anything they throw or shoot at you.

It's just a shame it probably won't ever get updated with new official content. Most of the user maps are junk.