But, yeah, Sandman's importance really diminished about halfway through the movie. His motivation just... died, and he just showed up from time to time to cause trouble. But in a way I was kinda glad because he seemed like something of a peripheral character, and it left more room for the more important things to play out.
I think it was something of a case of too many villains, and I actually thought that Sandman was dead when Peter flushed him away in the subway station. I mean, he didn't really do much after that anyway, and it seemed about time for Brock to actually do something. Hell, they gave Harry two fake deaths in that movie. I seriously thought he was dead when he, I don't know, blew up. But then they just didn't even follow it up, mention, or even allude to Harry again until Peter seeks out his help at the end of the movie. I seriously thought he was dead for about half an hour. And I wasn't sure how I felt about that. It was kinda cool to be so low-key, but, at the same time, just like when I thought Sandman had died, it seemed like they were rushing a bit to tie up the multiple plot threads that they had left dangling by having so many concurrent plots.
But, still, I enjoyed it overall.