Still Alive
Seven years later, Portal 2's campaign still holds up fairly well.
It did surprise me that it took so long before I got to Cave Johnson. And that the Cave Johnson parts were over so quickly. In my memory, this - wandering through the abandoned archives of Aperture - was the bulk of the game.
But in replaying it, the archives were actually a pretty minor segment, compared to all the stuff before (routine Portaling) and after (Wheatley's insane shit's-on-fire puzzles). That other stuff is still fun, both in puzzle design and in humorous writing and voice acting; Cave Johnson is just so much of a show-stealer, that the rest of the game isn't as memorable.
Compared to the thrilling action-adventure jaunts of today, Portal 2 is a little on the short side (5-6 hours), and takes a little while to warm up. But it's still perfectly enjoyable and worthwhile.
Better than: Portal
Not as good as: The Witness's first-person puzzles, and Borderlands 2's humor, both somewhat debatably.
Last time, I wrote: "I look forward to even more from the Portal franchise." I still do, I guess, though we may not live to see it.