I think Spidermans update in 2011, updating the technology slightly and bringing the animation to HD level has helped somewhat - it was quite clear it was animation, as opposed to filming, but the whole "cartoon" nature of the ride meant that it was quite well integrated.
Oddly though, I really disliked the roboarms. Yes, they were smooth but I felt really nauseous on them, which of course will have affected my opinion of the ride as a whole. Once again though, I may have built them up in my head due to the whole "these are the next big thing" during the (clearly exaggerated) SW6/Thirteen construction discussion back in the day. Next time I'll take a buccastem and make sure I'm able to experience it in the full - we only did it once (despite having plenty of time to do it again) due to both myself and the other half being a tad disappointed with it! The ride is clearly something you need to do a couple of times to see everything, so not doing it again is probably the only disappointment of a phenomenal holiday.
I agree with you on the 'sum of parts' statement - the whole Harry Potter area(s) are done to such a scale that regardless of your love for the novels you will enjoy it and is the best experience I have ever had in a park. It had to take something special to knock ToT off the top spot, and it did. I'm hoping to return in a couple of years, work permitting, to get to experience it again!