It really didn't age well if anyone is getting that itch. The atmosphere is phenomenal but the puzzles can be extremely frustrating. Back in the day, that wasn't a problem because exploration felt like a privilege. Now, the scenery doesn't captivate like it used to and you just want to know how to solve the stupid thing.
Portal 2 is a great brain-teaser if anyone is looking for a constructive use of their time tonight. I recommend the Nyskrte NYS maps if you want a real head challenge.