End movie is a mix of excellent and wtf?! GLaDOS deleting Caroline was fully expected and I'd have been disappointed if she hadn't done so.
As soon as she said she was letting you go and the elevator started I figured on three possible endings when the doors opened, first that you would find another long term relaxation chamber as you started in.
Space! Second that you would actually reach the surface to find a desolate wasteland in the aftermath of the combine occupation as valve have said that it is set in the same universe. Third was doors open to an army of turrets and a fade to black with gunshots. The turret song was a big wtf?! moment though
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I knew I'd seen a fat turret taking a lift before me early in the game, and spent most of the game wondering when I'd have to fight it, so it's appearance was nice.
So much space! The king turret from one of the early aperture video walls was a nice touch as well.
The conclusion of the ending does kind of rule out Chell making a reasonable return in a portal 3 but we have the bots now, and yay! our original companion cube survived and is reunited with us!
Wheatley going mad with power as soon as he took over was obvious as soon as the potential came up but still done very well. His progress from stupidly simple tests to more and more imaginative ways to kill you was done really well. Culminating in him actually following some of the evil overlord guidelines for dealing with heroes in a fight. (starting the neurotoxin before going into his plan, using shields, booby trapping the self destruct button).
The original aperture labs section was excellent, particularly the narration by cave johnson and his slow descent from an optimistic and arrogant start at the setting up of the original labs to tired and sarcastic as the money starts to dry up and prestige fades to the bitter and angry dying old man. The levels had the most challenging sections of the game as there were so many areas outside of testing chambers that you had to navigate without much in the way of guides.
I'm in space! Also a lot of backstory can be figured out in this section by reading all the posters and notices along with caves descriptions of the closed off tests.
Potatoed GLaDOS was fun with her commentary between tests and as her memories as Caroline started to return. Still never moved from being an enemy in my mind as she is simply too dangerous to drop your guard like that.