Problem is...Some of you are confusing tech and art.Good tech and hell of an art could mean game would look better in a lot of peoples eyes than hell of a tech and good art.We don't have their papers,we don't know what they utilized and what they didn't utilize,all we know is that they added bunch of stuff from Gears 1 to Gears 3 and still made game looking tons better.
Forward rendering was chosen because UE3 was done by 2004,and all Epic thought about was getting in next generation first and having best tools,they didn't give a crap about gazillion light sources.From all I'm seeing I dunno how you guys don't hype up GTA IV as technical achievement...Deferred renderer,huge,detailed open world,animations and physics second to none,24/7 time of day,every single thing in the world is dynamic...You can even break walls in lots of instances,still,I don't think alot of people would say that game looks more impressive than Gears 3,even though Gears 3 is forward renderer(its not like it matters that much) and doesn't include ~200 light sources per scene.