I wasn't claiming they were better films, just that they used the "digital backlot" methodology better.
That said, I personally like 300 BECAUSE it's just so insanely overwrought and nutso. (Plus I was a fan of The 300 Spartans in my youth and I'm a sucker for the story.) Conversely, Sin City has very quickly turned me off each time I've tried to watch it.
And note that I'm criticizing Sky Captain from a place of love - I was very excited when it came out, saw it theatrically, got the DVD... But I was never blind to its many faults, and alas, time hasn't improved it.
Regarding some of the other things that have been mentioned... The Shadow is far from the worst of the boomlet of comics/pulp films that followed in the wake of the 1989 Batman's success; I'd nominate The Phantom for that position. And The Spirit is just a misbegotten disaster from beginning to end: Will Eisner deserves better.
I never said you claimed they were better. I was just advocating for Sky Captain as a general point since the other two came up.