Originally posted by: jiffylube1024
If by 'suddenly' you mean in the last 5 years or so, it's because Epic has been constantly working on improving and updating their unreal engine, not only having clear generations of the Unreal Engine but games based on the engine 'up to that point' (improvements/refinements are ongoing).
Here's a (surprisingly long) list of most of the games using the Unreal or Unreal 2 Engine (borrowed from the Unreal forums):
Unreal 1
Return to Na Pali (expansion pack for Unreal 1)
Adventure Pinball
Rune
Nerf Arena Blast
Wheel of Time
Deus Ex
Klingon Honor Guard
DS9: The Fallen
Unreal Tournament
Mobile Forces
Harry Potter and the Sorceror's Stone
America's Army
Undying
Raven Shield
Unreal 2
Unreal Championship
Splinter Cell
Deus Ex 2
Unreal Tournament 2003
Unreal Tournament 2004
Devastation
Harry Potter and the Chamber of Secrets
New Legends (XBOX)
Desert Thunder
XCOM: Enforcer
XIII
Magic: The Gathering Battlegrounds
TNN Pro Hunter
Thief: Deadly Shadows
Harry Potter and the Prisoner of Azkaban
Unreal Championship 2: The Liandri Conflict
Advent Rising
Pariah
Lineage 2
Dead Mans Hand
Splinter Cell: Pandora Tomorrow
Raindow Six Athena Sword
Shadow Ops: Red Mercury
Tribes: Vengeance
Men of Valor
Brothers in Arms
Star Wars: Republic Commando
Splinter Cell: Chaos Theory
Pretty impressive eh? When a developer chooses to use the Unreal Engine technology, they get to use the most current build of the Engine available, so someone using the Unreal 2 engine in 2004 would have some improved features/graphics/etc. over someone using Unreal 2 technology in 2003.
The Unreal 3 engine, with games based on it to come out in late 2006/2007, looks to be the most impressive yet, too!
Edit: here is the
official list of games/Engine generations/etc. Pretty interesting...