New games like 'The last of us' which are pushing the current gen consoles to their very limits, in terms of graphics and play style and ideas will always have a bigger impact than new entries in a series like the GoW's.
The whole play style of GoW (gears) is kind of getting a bit dry, the cover system is nothing new, it wont have the same exciting impact as the first entry did.
GoW (god) will be releasing at a good time, when alot of games released nowadays are shooters, and an AAA hack n slash hasnt been done for a while (dont mention darksiders please)