It's you.
- Half-Life 2
- Forza
- GTA San Andreas
- MGS Snake Eater
- Doom 3
- World of Warcraft
- Resident Evil 4
- Shadow of the Collosus
- Psychonauts
- God of War
- Oblivion
- New Super Mario Bros
- Rock Band
- Gears of War
- Bioshock
- CoD: Modern Warfare
- Half-life 2 E1 / E2
- Portal
- Team Fortress 2
- Halo 3
- Super Mario Galaxy
- Wii Sports
- Uncharted 1
- Assassins Creed
- Mass Effect
- GTAIV
- Fallout 3
- Left 4 Dead
- Smash Bros Brawl
- Braid
- Arkham Asylum
- ...
And more. Sorry if I left off a franchise that I might have missed. These are the games that were noteworthy to me, but I'm sure there's plenty more that resonated with other people. I tried to leave off sequels except for major, major games (GTA, Fallout, RE, MGS, etc).
Honorable mentions of games that have been forgotten but were pretty major at the time:
- Riddick
- Def Jam NY
- Fable
- Far Cry
- Madden 2005
- NFL 2K5
- MVP Baseball 2005
- Indigo Prophecy
- Just Cause
- Skate
- Saints Row
- Dead Space
- Mirrors Edge
- Chinatown Wars
- Borderlands
- Dragon Age
- Demon's Souls
- ...
Then toss the games on that were sequels of those games that many think are better... Skate 2 or 3, Assassins Creed 2, Just Cause 2, Saints Row 2, etc.
Not only that, but 2004-2009 is a defining age for when online gaming became approachable on consoles. Prior to 2004, playing a console online was incredible niche... Maybe for some people with an Xbox, or some people who took a chance with the Dreamcast or the horribly shitty online PS2 experience with that adapter, but by 2004, Xbox Live had started to have a presence... And then by 2006, Xbox Live would completely change online gaming. Even as a PC veteran, I was amazed at how well XBL worked on the Xbox 360... When for years even with functioning hardware I was renting surverys, sending IP numbers to friends over AIM, fighting with different systems like Gamespy 3D/Arcade, HLSW, internal non-global systems, etc. On the PC side, Steam would start to take off as a viable product in 2004 and unify the myriad PC-gaming online services like WON.net and whatever else.
I think there's a lot of things we take for granted from 2004-2009 because now it's like "Oh, Modern Warfare is just another CoD game..." or "Gears of War is just another GoW," or "God of War is just another God of War game..." but back when those games came out, they were seminal introductions to those franchises that completely challenged gameplay mechanics before them.
Now we might be bored by the 20th iteration of Assassins Creed, Just Cause, or what have you, and
now we might see Bethesda RPGs as formulaic, but back in 2006 or 2007, that wasn't the impression. Those games were all landmark achievements.