A Million Suns is one wild ride. It has more action than Across the Universe and a hell of a lot more crazy. Seriously, you're going to wonder what else they put in the water. Elder was a bit annoying at first, but being the youngest person on the ship and being the leader is bound to make anyone a bit whiny. I still like Amy the best, and her comment about wanting to choose who she loves rather than just picking him because he's the only one there made me smile (I know they are going to end up together, but it's nice that she acknowledges the problem). 
 All the other characters are seriously off their chain crazy. For real. All that passivity from the first book - gone! 
 The one thing I didn't like was the plot device used in the beginning that continues throughout the book. I know that plot devices are used because they work. And normally I don't have a problem with these things, but this is the one that drives me most crazy in any book. It's the "I'm going to leave you a video (or letter) with some information, but at the end I'm going to say 'follow the clues and you'll find your answer'" Ugh! Seriously. Just tell me whatever it is RIGHT NOW! Do not send me on a treasure hunt!!