The word simulation & Gears still doesn't belong in the same sentence, there's no technically lol.
It's a 3rd Person Cover based shooter, just like Uncharted minus basic platforming / traversal elements.
Have u ever played a GoW game?
Also here maybe you should read what he really meant.
Cliff Bleszinski said it himself, Gears of War is a Bada$$ Simulator. Why is that important? Because when the player feels like a "Bada$$" their emotional connection to the game increases exponentially - and in some cases that can be even more important than solid gameplay. Gears of War is brilliant when it comes to this.
That's exactly what I mean. Even on IGN's review it states that this is one of the best military simulators, alongside COD and BF, although those are FPS. Lol it simulates you "feeling" like a bad-a?
And Rockband teaches us how to play instruments & Just Dance is a dancing simulator.