Great topic, brought back some memories!
These are my 2004 picks:
Battlefield Vietnam
UT 2004 (still the best).
Thief: Deadly Shadows
The Chronicles of Riddick: Escape from Butcher Bay
Doom 3
Tales of Symphonia
Far Cry
Final Fantasy VI (so good)
Fable
Warhammer 40k: Dawn of War (so, so good).
Star Wars: Battlefront
Rome: Total War
Tribes: Vengeance
GTA: San Andreas
Half-Life 2 (confirmed)
Vampire the Masquerade: Bloodlines (maybe the best RPG ever?)
Metal Gear Solid 3: Snake Eater
WoW (just wow.)
KotOR 2: The Sith Lords (so underrated, but quite broken)
Fallout BoS would have made the list because, Fallout...but yeah, it stinks.
vs 2014:
The Banner Saga
Bravely Default
Tales of Symphonia: Chronicles
South Park: The Stick of Truth (everyone should play this.)
The Walking Dead: Season 2
Dark Souls II
Hearthstone (so good..it hurts.)
Titanfall
MGS V: Ground Zeroes
Bioshock Infinite: Burial at Sea pt 2
Diablo 3: Reaper of Souls
Don Bradman Cricket (best cricket game, ever.)
The Elder Scrolls Online
Baldur's Gate EE on Android
XCOM EU on Android
Wolfenstein: The New Order (what a revelation this was!)
Watch_Dogs
Mario Kart 8
Valiant Hearts: The Great War
Shovel Knight
Divinity: Original Sin (maybe the best isometric RPG I've played)
TLoU Remastered
Ultra Street Fighter IV
Destiny (my current love.)
Wasteland 2 (backed.)
Hyrule Warriors
Middle Earth: Shadow of Mordor (lore 101.)
Alien: Isolation
Borderlands: The Pre-Sequel
The Evil Within
The Legend of Korra
Lords of the Fallen
Call of Duty: Advanced Warfare
Halo: MCC (drool..)
WoW: Warlords of Draenor
Dragon Age: Inquisition (CE preordered.. so excited!)
Far Cry 4
GTA V: Revamped editions
Well, that's funny... I was sure I was going to say 2004 was better before writing out that list, but now... 2014 just seems utterly amazing.
So much win in the RPG and FPS departments.. I'm in overload.
I give the prize to the new kid in town, 2014 gets my vote.