Brandon Routh was a great Superman and Spacey was a great Luthor, but that movie has so many problems that calling it a panacea for our current crop of superhero movies is a bit much.
Things I hated
-Superman as stalker
-Luther's plot (Real Estate again)
-Lois Lane decides to be dumb to advance the plot (I found where all this power was going, maybe I should go alone with my child)
-They managed to make Lois Lane unlikable, even if you understand her anger towards Superman
-The idiotic "Is Superman dead?" stuff at the end.
X3 may be bad but I had a way better time watching that movie.