Call of Duty 4- Great first person shooter game. It has a fun single-player campaign, but the real joy is when you get to go online and take everyone else out. C&C3/ Red Alert 3- Not bad games. Like most other RTS's, they definately take some practice to be able to beat the computer on anything higher than easy, and it takes even more practice to beat other people online. However, if you like large scale games, you will have a hard time going back to C&C once you play the following two games... Supreme Commander- A traditional RTS, except bigger. Much, much bigger. The scale on this game is incredible. How can you beat destroying giant robots with other giant robots? The campaign is neat because each mission isn't a normal short little mission. You will have a task that would make up an entire mission on other games. Once you complete the task, the map expands, and you get another task that is normally the equivilant of an entire mission in other games. Once you complete that, you get more map and another task. This is a must buy in my opinion. Sins of a Solar Empire- A RTS, but not a "traditional" one. It is a mix between RTS and 4X (explore, expand, exploit, exterminate) games. Set in space, you are fighting large scale battles, and the goal is to colonize planets while pushing back your enemy's borders and protecting your own. This is one big damn game. I recently completed a game that was over 8 hours long. You can play on anything from small 5 planet systems to huge galaxies that have 5+ interconnected systems that each have 20 or more planets. This is also another good must-buy in my book.