I was more on the Garnett side of the Portal 2 discussion. Unlike, Jeff I rarely felt “smart” for solving a puzzle, I felt more like “I figured out what Valve wanted me to do.” There were so many moments where the environment was specifically designed to lead to you a solution. Maybe it is the Architect in me, but I have an eye for extraneous overlooks that serve no other purpose. (I’ve never designed a catwalk with a random part jutting out). I realize it was necessary for the places outside the test rooms but it brought me out of the game. The story kept me playing but the "twist" was telegraphed and it overall was very Bioshock-y.
Anyone who thought the SP was too easy, should try the co-op. Already a few hair pulling moment and I'm not done.