What's wrong with 4?Space empires 3 and 5 are fun. 4 is no good.
I thought it was alright.Gal Civ is poo...
Which versions though?I'd much rather be playing AC or MOO
Good Games:
-Homeworld series (Cataclysm was my multiplayer favorite, but the second is best if you like Rock-paper-scissors style multiplayer.)
-Fallout series (Fallout 3 is coming

-System Shock series (Which includes Bioshock. Some great co-op in this series.)
-Freespace 2 (I believe there was a legal way to download this. Great engine, excellent mods.)
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-DWARF FORTRESS!!! I actually use the original tileset, and I can play it quite comfortably. Graphics DON'T make the game. Never have and never will, but some people get spoiled by today's standards. In fact, I find a lot of old games with more depth/fun to them than some of the popular mainstream stuff today.
The fun in this is watching it all go to hell, then watch the blood and limbs fly. There is no win condition, just a LOT of lose conditions. I like trying to guess which one will snap first, and who will be killed first. The whole game unfolds into a miniature story.I already heard descriptions and they didnt sounded very fun for me...
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-Dungeon Keeper
-Hardwar (Great LAN games if you have the time, be sure to pick up the patches and modding stuff for it though.)
-Allegiance (Free, MMORTS. Usually 1 and a half servers full at any given time.)
-Worms Armageddon (LAN is fun)
-Anacreon (Possibly the most complex game ever made. Brilliant, far surpasses any modern game for strategy, but... ACSII)
-NOCTIS! (Get the CE version. I WANT this on DS. Version V is coming out in a few years.)
-Be watching the 'Infinity: the quest for earth game', but it probably wont come out till 2009 to 2010. It wins my vote as the best game engine ever made.
-Red Faction (The original, the second was attempted mainstream garbage)
-The original Unreal Tournament. The vehicles added later were cheap, and the weapon balance after the original was garbage.)
-Gate 88 is fun for LAN, one of the fastest paced MMORTS-es I've ever seen. It's free and open source.
-Garry's mod. Though not technically a game. The only reason I got HL2 was for mods such as this.
-That old TIE-fighter game. Can't remember the name. Pops up occasionally on 'best games ever' lists. Far outdated graphics.
-Oblivion and Oldblivion (A hack to let Oblivion run on old hardware with excellent graphics)
-Morrowind (Only if you have not played oblivion. Once you play oblivion you can never be satisfied w/ Morrowind.)
-The original FarCry. (It required thinking, whereas the 'feral' thing in the later ones turned it into a hack and slash.)
-Quake II multiplayer. (Still my favorite Quake game. I love 'racing'->LAN game, free-for-all on 'co-op', first to the end of the level scores a point.)
-Warzone 2100, fresh spin on RTS-es, but old. Free.
Can't think of any others off the top of my head, but there's a lots more. Start poking around for 'greatest games of all time'/'best games ever' lists to find some more ideas.
Forgot: The original ground control. Free w/ a fileplanet account I believe.
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But it's the most expensive game out there, requiring you life, soul, and all your mortal time. Oh yes, and ~15 USD a month.I hear World of warcraft is a good game.
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I never got into video gaming for quite a while. So I started looking up 'greatest games' stuff when I did, and found a bunch of golden oldies I had missed. This list isn't all of them, but I think my post will explode if it gets any bigger.