In a recent interview with 1UP, Valve's Gabe Newell said the upcoming title is internally accepted as the best game the company has ever developed. With a portfolio including Half-Life, Team Fortress, and Left 4 Dead, that's saying a lot, and if you weren't already excited about Portal 2, you should be now.
Newell added that Portal really seemed to resonate. It showed Valve what people liked, as well as what they didn't, and gave the company what it needed take Portal to the next step. Earlier this week, Valve's Doug Lombardi said the original Portal was a "test bed" while the second will be "a game."