Not that I've followed it up as much as I should, but there's a real problem with the ICC. They announce things, and then ... nothing happens.
I sympathize with them. They've kind of got the UN problem: they mean well, but if the members aren't co-operating, it doesn't work. Worse, since the worst criminals are USians and the US is not a member (but many members are subservient to US), they are being openly and freely defied all the time, which is bad not just for image but over the long run for legitimacy.
As long as Western nations are determined to suppress prosecutions of their own state actors (and almost all are collaborating in that effort right now), the ICC is just another way to demonize the former colonies, so far as I can tell.