Casino Royale 8/10 - not really a Bond fan, but this is my favorite Bond film. Almost gave it a 9.
Quantum of Solace - 6/10. 6 of those points are probably give for attempting to be an actual sequel to CR. Starts out good, but quickly goes downhill and basically becomes a glorified episode of Burn Notice. I do love the ending tho and how it ties up the Casino Royale storyline.
Skyfall - 7/10. I struggle to give this a 7, and probably only do so because it is well paced, has good beats and tension. But the story borderlines on ridiculous and there are too many plotholes.
Not seen Spectre yet but I heard it's not good. Then again I heard Skyfall was good and I was not impressed.