Wolfenstein (2009)   

In Wolfenstein you play B.J. Blazkowicz, a highly decorated member of the office of Secret Actions(OSA).

You are sent on a special mission into the heart of the Reich to investigate evidence of the Nazi's possession of a new and mysterious power.

While behind enemy lines, you discover they have done much more than develop a new weapon. The Nazis are harnessing the power of a dark parallel dimension called The Veil; in order to create a weapon of war-ending magnitude.

Move between the Nazi's dark reality and yours as you command an enormous arsenal of Resistance and Axis Weapons. You can also turn to the Black Market for weapon upgrades, or unleash the Nazis own dark powers and perverted science against them with supernatural weapons and Veil-enhanced firepower.

This game offers new and old players something.  It has a great single player campaign and online multiplayer as well.

ArmA 2

Here is what you can expect from Arma 2:
Player-driven story

Role-playing and resource management elements. Command your troops through a branching campaign full of twists and surprises.

Extensive multiplayer

Play the entire solo campaign cooperatively or dive into huge PvP battles for control of the whole map.

Mission Editor

The Intuituive, powerful mission editor lets you design your own missions in minutes or create intricate and unique campaigns. Infinitely extend the game!

Authentic weapon simulation

Bullet ballistics and deflection, material penetration, real-world magazine capacity, tracers, ammunition types and stopping power.

Unique AI

No scripts, no pre defined pathways. AI adapt and use the open environment on the fly. AI share information, flanking and taking cover to surprise and outsmart players.

Dynamic conversation system

ArmA 2 integrates preset conversations with dynamic queries about the game environment. Talk to soldiers in the field and civilians caught up in the fighting. Soldiers shout and use hand gestures based on real world military doctrine.

Dawn of War II

Developed by award winning Relic Entertainment, Dawn of War II ushers in a new chapter in the acclaimed Real-Time Strategy series - taking players to the brutal frontlines of war to lead an elite strike force on a mission to save the galaxy.

It is the 41st Millennium in Sub-Sector Aurelia - a cluster of worlds on the edge of the Galaxy - and a battle of epic proportions is about to begin. Ancient races will clash across the planets that dot this section of space, battling for the greatest of stakes - not only the claim to the land and its bounty - but the fate of each race.

With a focus on fast-action RTS gameplay, Dawn of War II brings to life the science fiction universe of Warhammer 40,000 like never before. Experience the intimate brutality of battle as you play through the epic campaign. Clash with enemies on battlefields ablaze with visceral hand-to-hand and ranged combat. Lead and develop your squads into the most battle hardened elite strike force in the Galaxy.

Saga MMORTS:

SAGA is a persistent world RTS in an epic fantasy setting. Players collect troops, build armies, conquer new lands and build up kingdoms, complete with resource collection, city building and peasant management. SAGA's features include massive armies, multiplayer questing, guild wars, espionage, and an auction house for trading troops and spells.

SAGA has no subscription fees. Players pay as little or as much as they decide, by purchasing 'booster packs' of random troops and spells, which are traded and customized to create the strategic army of choice for each player. Visit www.PlaySaga.com