Klar, as someone who has read quite a number of Sherlock Holmes pastiches, I think you have made an excellent observation and I thank you for it.
Superman Returns, like most Holmes pastiches, does an incredible job at imitating the most minute details and of sounding and looking just like the real thing; but it also gets so much wrong and is sadly missing the heart and soul.
And now knowing
Superman Returns for what it is - a Superman pastiche - I can appreciate it.