The Bond legacy which began as a British fetish against the Soviet state and and an imaginary anti-communist propaganda movie could not have come so far if it lacked the imaginative and charismatic portrayal of a spy.
Some accolades that Skyfall has received on Rotten Tomatoes are
"Craig manages to get out of the shadow of Connery."
"Conveys the melancholy of loss, mortality, and future-shock anxiety, while at the same time leaving us plenty of space to enjoy one of the most complexly unhinged villains in Bond history."
""Skyfall" stands as one more shrewd blast of cinema ecstasy in a long history of compelling 007 spy movies."
As for the negatives , you can see a clear parallel between Christopher Nolan's Joker and Silva which I feel is not unintentional or coincidental. The bond girl's taste of lipstick did annoy me. Bond's romancing skills need a major upgrade. Honestly the shower scene is rather boring and outdated. Apart from that, the purposeful complacency of some characters making way for Bond's acrobatics is somewhat unbecoming of a Spy movie.
Some of the negatives comments on Skyfall are
"Skyfall keeps mocking 007 as old and out-of-touch. He goes unshaven and fails his physical! The ice-cold erotic charge of an immaculately groomed Bond is dead. Fleming's 'blunt instrument' has bad knees. He's one of us now."
"Skyfall doesn't have the layers it needs to strut so casually for so long."
"Where have you gone, 007? Skyfall has transformed you from the human, vulnerable, skillful spy into a Superhero Bond. In Skyfall, Bond is part Aquaman and part Road Runner, with some familial angst pilfered from Bruce Wayne. He's become an action toy."
Though many would complain that blinded Bond fans need their dose of opium every year , I would say that this dose possess you throughout the movie. You need not be a Bond fan to run to theatres to check out this movie. Though you can find reviews showering extravagant praise or scathing criticism, it is best if you judge the movie yourself.