IGN published a spoiler-free review of The Force Awakens: http://www.ign.com/articles/2015/12/16/star-wars-the-force-awakens-review
Star Wars: The Force Awakens is the movie it was promised to be, with great new characters, a respect for the original trilogy and a strong understanding of what makes this franchise click with fans. The new additions to the Star Wars universe work best, though there is some over-reliance on tying things to and making nods to the classic Star Wars films. Overall, this is a great way to reboot the franchise and open the world up for a new generation of fans.