Coming out next week! At first i had dismissed Portal as a semi-interesting puzzle game from only seeing bits of gameplay, but after playing through it to the end i was won over by the robotic antagonist. Being a musician i really appreciated the final treat in the game. I have high hopes for Portal 2.
So far i find the game to be: very humorous with several laugh-out-loud moments, decent graphics, interesting new portal mechanics, and great use of music/effects. Too many loading screens though. Haven't tried the co-op section yet.
Have now completed the game, it was a great experience and in some ways topped the original. The co-op puzzles got me thinking more about the Super Synergy mode for Clones..