I watched it a week or two ago. I am not a fan of superhero movies - I find them fun, but I can't get on with comics and so don't know a lot of the back-stories. My partner really likes superhero stuff (well, Marvel anyway), so typically I get a fun action flick and she gets the awesome fandom thing, then we have really interesting discussions for days afterwards. Ryan Reynolds is also one of my favourite actors.
We were both cringing the entire way through the movie. The sarcastic humour was misplaced, the scenes both cheesey and predictably clich? and the CGI bad and over-relied upon. If we weren't watching it because "it can't be that bad" and figured it would be fun to sit down with a bottle of wine and unwind, we would have turned it off several times - it almost became a point of pride that we were going to finish the abomination.
What possibly doesn't help is that we both think that the Green Lantern is an absolutely shit superhero to begin with, the entire concept stupid (his nemesis is...yellow?). Maybe it was never big in the UK, but amongst my nerdy friends I have never heard it talked about.