2004 is done! Sorry I went out of town for a long weekend. Pirates is going to win with 2 votes lol. Everything else had one, unless I counted wrong. I don't think I did.
But yeah civ4 should be the runaway winner, it's a civ forum! I find it really hard to believe long time posters here haven't played it much. Did you get here from civ3 and then not like 4 and jump to 5? I feel like a large majority of long time members joined during 4's hayday and then of course a ton of newbies have joined since discovering 5. While I don't find 5 engaging at all, steam platform has done wonders for its popularity and it's got to be the best selling civ game ever.
Civ4 though, where to begin? If I was making a top ten list it would be number 1. I think it's the apex of the civ series. The way commerce works just seems so intuitive yet deep. I love how specialists work and you can manipulate your production and leverage your economy in so many ways. Ok so you have gold mines? Good, run high research. Oh you are food rich? Build libraries and run scientists. You have a lot of iron and copper production? Research alphabet and have cities build beakers. So many options. Lots of rivers? Try state property. You get the idea. I just love the flexibility. Civ5 feels like just a lot of addition of bonuses, not really choosing and switching between stuff.
The combat also works for me cus it's tactical enough without overshadowing the entire rest of the game. You know civ 1 and 2, combat was an afterthought, you won by having better tech pretty much. Civ3 added better hit points so you could win with better numbers sometimes. Civ4 pretty much fixed all of that, introduced rock paper scissors concepts so now specialized units can counter others. Tech usually wins, but not always, and if you have enough collateral damage you can beat anyone. It was amazing concept because now the AI doesn't become completely irrelevant for falling behind in tech. Montezuma and Genghis can still throw their weight around even though they are bringing catapults to a gun fight.
And then the modding! It's easy to get your own custom maps and scenarios and have a ball. I could go on and on about civ4, from how they handle religion to trade to diplomacy, all sorts of things. Easily my favorite 2005 game, probably my favorite game ever, even though I have more time on Wow and Dota. Civ4 was equally addicting and still is from time to time.
Other than that I'm not seeing a lot of games I played from 2005. I see a lot of notable ones I haven't played like:
Shadow of the Colossus
Age of Empires 3
Pyschonauts
Call of Duty 2
Jade Empire
Lego star wars was also very good. Did that launch the lego games? there's so many now. I think batman came out later, star wars might have been the first in a long franchise.