Fallout 1 and 2- Along with PS:T below, form the holy triumvirate of computer RPGs. Really sad to see the "sequel" turned into a hybrid action game with stats and a dialogue tree such as Oblivion. We already had the excellent STALKER game out, this series deserved better IMO (yes I know, many out there love the new one).
Planescape: Torment- I love everything about this game except for the god awful "real time with pause!" combat that plagued Baldur's Gate and such as well. The rest of the game more than made up for it.
Operation Flashpoint- Not all that impressive upon release, but the mods made it incredible, and the single player campaign was done MUCH better (and much more fun) than the one in Armed Assault.
Close Combat 1-3- 2 being my favorite, I still replay these classic wargames, though not so much 1 anymore. The MatrixGames "CC: Cross of Iron" remake of CC3 has been fun as well.
Talonsoft's Campaign Series (West Front, East Front II, Rising Sun)- The games that got me into "real" PC wargaming, waiting for the MatrixGames remake of these (on that site as "John Tiller's Campaign Series) was like being a kid at Xmas all over again. Lots of depth, hard to master, but don't take a giant time commitment to learn.
The Operational Art of War- Another big one from Talonsoft and Norm Koger now re-released by MatrixGames as well, a huge, fun wargame with a powerful scenario editor, which ensures you never run out of things to play with it.
Europa Barbarorum- Rome: Total War mod that turned Rome: Total War from a dumbed down waste of $50 when compared to Medieval (1), into one of my favorite games. A history nerd's wet dream come true, when modded to work with the RTW "Alexander" expansion, the strategic AI gets a much needed boost as well.
Civilization 2- I played this one for a good 10 years until Civ 4 came out. Not sure why, but I just didn't like Civ 3 at all for some reason.
The Marathon Series- A little known series of shooters by Bungie that came out back in 1994 and beyond on the Mac, weren't released on the PC until no one cared about them any more. All the action of Doom 2 (which was huge at the time) with an engaging storyline similar to that of System Shock 2, these games were gems that are still relatively unknown.
Jagged Alliance 2- the best isometic tactical turn based shooter since X-Com.
HPS Simulation's "Squad Battles" series- another set relatively unknown outside of wargaming, probably my favorite squad level wargames on the planet. Again, relatively easy to learn, but not easy at all to master.
Medieval: Total War- the first one. IMO the best of the series, and the last one that the developers remembered to include a working AI for. I still play it with the "XL Mod" to this day, assuming it gets along with my PC.
Mircrosoft Flight Sim 2004- Have a load of add ons for it, and it doesn't require a supercomputer to run like Flight Sim X does- with my scenery add ons, FS2004 looks much better and runs much smoother on my PC than FSX did. A sim I can easily play all day.
A few more quick ones:
Galactic Civlizations 2 and add ons
The Gabriel Knight Games
The Monkey Island Series
No One Lives Forever 2
Falcon 4.0 and Allied Force
Space Rangers 2
Gates of Troy
- I tend to re-play a lot of my favorite games. Most of the new ones just seem like cookie-cutter re-releases of the same games that come out year after year with better graphics. I just don't get excited about them anymore like I used to.