I'm not a massive fan of the Fleming novels, and I found Casino Royale to be one of the best Bond films made...
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Also, Casino Royale is exactly what Bond is supposed to be. Along the lines of From Russia With Love, and On Her Majesties Secret Service. I'd rather have these over Quantum of Solace any day.
So you find the Bond films which are closest to the books the best movies, but you don't like Fleming?

I'm going to come out in defence of the Poker scenes in CR, which I found a welcome change of pace from the Slam-Bang numbness I felt during the Brosnan era. Taking aside the pre-titles, the free-running scene and the Hotel poker scene, I actually find the first half of the movie reasonably bland to rewatch. This changes once we get to Hotel Splendide and the Poker scenes. Sadly, it all rather falls apart in the last act (Venice) - but hey - it generally works.
I find QOS is a mess. I want to like it more than I did. I actually really liked it the first time I saw it. Sadly it doesn't seem to hold up as well after a few viewings (for me at least). I know there was probably once a reasonable movie in there somewhere, but the poor whiplash editing destroys it. It has no time to build up any tension or emotional depth as a result. I'd argue that CR did achieve this on some levels.