I'd agree with this. I found it quite easy to be honest. I took my time and had it done in 7 hours. only got stuck on 16/19 and even then it wasn't for very long. Also the last boss fight was super easy did it first time without any hassle. I could have done with some added difficulty or making the game longer. It's also a shame that there's 4 hours of co-op content that I can't play cos I have no friends.
On the positive side, the one thing that valve do better than anyone else was still there, atmosphere. Just like in half life, your not some guy with a mouse playing a game, you ARE Chell. The game sucks you in and makes you not want to stop. "Just one more chamber and then I'll get something to eat" he said, 14 chambers ago. The story was decent and the voice acting was solid. The new features, different gels, tractor beams and light bridges where brilliant additions. Looking forward to the presumably free DLC (PC version).