So, Portal 2 is on its way this Christmas. At the same time, a sequel to Tron is on its way this Christmas. Oddly enough, the former prospect excites me while the latter prospect frightens me.
I think this is largely because the worst case scenario for Portal 2 is that it tries to be Portal. In such a scenario, you'll have the charm of the mind-bending puzzles, though perhaps you won't experience a plot that's quite as original, creepy, and involving. I can live with Portal 2's worst case scenario, and the potential jubilation the best case scenario represents is off the scale.
Tron Legacy is very different. The worst case scenario is an absolute disaster. The movie is clearly trying to be two things at once, a call back to arcade nostalgia and a flashy special effects film. Those are two very different beasts, and yoking them together will take a great feat of directorial and editorial strength. I suppose the best case scenario is that Tron 2 becomes the Starcraft of 3D special effects films, perfecting the formula and setting standards for decades to come. I'd definitely enjoy that, but I don't harbor a shred of hope that's what will happen.