This is my experience over the past 6-7 months of moderation:
We've gone through a lot of tweaks and plugins. When I first became mod, we had about 30 report abuses in just 10hrs, so in a day, about 50 reports, now its 10 reports in 10hrs. Us mods were banning in-game a lot more often than now. I used to see hackers in every game, but then I took NCP to the knee, but now I only see hackers every 4th or 5th game, or even more! So NCP is doing its job. (Ok, I don't play often, but when I do, that happens)
Programming is a buggy world, there will always be bugs, the most buggiest will be the protection software's, since they are harder to make.