Chivalry Medieval Warfare is really good if you're after some pure multiplayer killing madness, or a new-ish indie game on steam called The Swapper is something I've been enjoying recently, the puzzles are really quite something and it's such a lovely moody game
TES IV Oblivion and TES V Skyrim are both great games if you like RPGs. You should also be able to get Oblivion at a low price as it was released back in 2006. Keep in mind though I don't know those games you mentioned, although I have heard of them.
EDIT: I see you beat me to it regarding RPGs, but I'd recommend trying these two.
Batman Arkham Asylum
Batman Arkham City (the new batman game soon to be released looks fantastic, do not know when it will be released)
Max Payne 3
Team Fortress 2, one of my all time fav's and I ran a 300+ person community for awhile with several servers. People make fun of the hats and other items and I understand why but once I got back into playing it, it really was a lot of fun and TF2 has a great competitive community. Valve updates it constantly to this day.
Well, in terms of free to play games :3 There of course is Planetside 2, an awesome shooter with RPG elements on a MMO scale. Another kind of action adventure game still being worked on is WildStar which offers unique 'paths' with which to travel. Should be mostly in the form of MMORPGs. The Payday series is always fun even if you cant get a groupe of your friends out to play with you. Then there is always the binding of Issac if you havent tried it :3 Great arcade style action game with upgrades that make the replay value very high.
There are tons of videos up on youtube right now and the pre-alpha is due to be released on the 16th as long as they do not get overloaded or have their servers crash with all the excitement. It is really a true survival game with really good zombies. It is getting a lot of attention now that they have raised so much money on kickstarter. You have to buy the $35 dollar pledge to get the pre-alpha.
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