>>718060140 (OP)
Traded Portal 1's oppressive and lonely atmosphere with only hints of what might be going on in the outside world, or what happened to everyone else, with the occasional, brief bouts of quirky humor, for on-the-nose random and quippy reddit humor with characters who never shut the fuck up and allow you to soak up the atmosphere.
Puzzles in Portal 2 also sucked, because they became way less about smart application of portals, and more about spotting the one square of portal-able surface. They overused surfaces you couldn't place portals on to such a degree that puzzles became linear and dull. The feeling of smartly using the tool you were given was replaced with the exasperation of finally finding the one square you're allowed to use the tool on after a pointlessly dull hide-and-seek segment.