You can't be "wrong" because you're stating your opinion, but it is an odd point of view that I'm not familiar with. You're suggesting that out of all the comic book movies that have come before and after SM3, that SM3 has the best musical score, CGI, and fight sequences. My mind is boggled.
I would argue that everything you mentioned was better in Spider-man 2, The Amazing Spider-man, most Marvel movies (especially The Avengers), TDK, TDKR, etc. I could go on and on here.
The symbiote theme was more annoying than anything else as well as completely repetitive. I mean, the SM3 score is essentially the identical score to SM3 only with the additions of the symbiote theme and Sandman theme, which were both underwhelming.
And yeah, some of the Sandman effects were good (mostly his first transformation), but that's really about it. Almost all of the black suit Spidey CGI was lousy, probably because it was difficult to render such a dark color. If we're being honest, the CGI looked more than choppy in plenty of places and the green screen work was quite apparent. The entire final fight was like a big video game sequence, nothing special.
I'll say that the special effects were solid for the time that SM3 was made and released, but not noteworthy or memorable in any way, especially not now.
You clearly have a love for SM3 that remains to this day and there's nothing wrong with that. You have every right to love it and praise it, but I don't think you'll find many people in this world that agree with you.