I finished Gears of War 1 last night. Man that game was superb. I liked it a lot more than 4 (which I played and beat last year, was my first GoW game) 1 had such a fantastic atmosphere, that game, has to be one of my favorite games from the 360/PS3/Wii era.
I started Gears of War 2 tonight. Noticed the graphics are a lot more colorful and the music is different, it's not..... horrorish? It's got a lot of orchestra star warsish style music. Seems really cool so far, but I am noot sure it will beat out 1 for me.