User blog comment:LoveWaffle/Looks at Screen Dumbstrack for a Good 10 Minutes at this Terrible Casting/@comment-6706183-20130129222733/@comment-1895174-20130129225138

Actually, Spider-Man 3 is the lowest-grossing of Sam Raimi's films. Domestically, at least.

And, as for why Spider-Man 3 was a critical disappointment, I'll quote the review aggregate Rotten Tomatoes:
 * Though there are more characters and plotlines, and the action sequences still dazzle, Spider-Man 3 nonetheless isn't quite as refined as the first two.