How would you have ended it? (SPOILER WARNING)
I would have brought it more full circle. Have Bond get ambushed in Italy whilst on the way to Vesper's grave. Have him not die at the end but just about make it out alive as Bond always does. End the movie with Bond finally visiting Vesper's grave and he burns Vesper's "Forgive Me" note and then walks away.
I just think thematically the whole Craig era has been about Bond being able to trust someone again after Vesper's betrayal.
Or maybe you liked the ending we got, I don't know but I personally think the ending is a dumpster fire.