Still wondering whether to dive into Portal 2? Over on our much-loved RPS, as good a steer as you need:
http://www.rockpapershotgun.com/2011/04/28/the-rps-verdict-portal-2/
As they intimate, the sequel’s potentially just a little fresher if you didn’t play the original, but it’s still a rare, polished thing of beauty and wonder, and will be looked back on as one of the interactive highlights of this year. Go and enjoy.