Casino Royale was great, however I feel it's held in such high regard due to the previous few Brosnan entries being, depending on your opinion, between average and totally shit.
Quantum of Solace was met with middling reviews, however it was my favourite of the Daniel Craig movies, and in terms of gritty realism he's definitely my favourite Bond, even if I'm not crazy about the likes of Skyfall or the abomination he finished with (especially the ending).