Now, this really is one movie that doesn't deserve its low rating on RottenTomatoes (only 26% so far!). It's almost like the critics collectively agreed they had given enough gold stars for the year to superhero movies, and picked this one to reverse the trend. Sure, Green Lantern isn't gritty or packed with complex issues. However, it's also well-paced, appropriately-cast, and keeps you entertained throughout. Unlike the mind-numbingly relentless action in the Transformers series, there's a good mix of everything.
Ryan Reynolds is in his element for the way the character was written, while his character transformation lacks the gravitas of Chris Helmsworth's Shakespearean performance in Thor, it still comes across alright. It helps that his chemistry with Blake Lively doesn't seem too forced, and the obligatory balcony scenes have just enough humour to keep you engaged.
Of course, there are plenty of pitfalls as well (which is what the critics have latched onto) - you pretty much have to leave disbelief at the door, and not be bothered by the cheesiness of it all. The plot doesn't exactly hold any surprises either, and pretty much unfolds as you'd expect. However, the key is that the movie doesn't seem to take itself too seriously. Overall, if you don't have too high expectations (which I'm sure most wouldn't), it's a fun way to fill an evening.