I doubt there are many things in this universe that are unambiguously good, but Chrome's sandboxing is certainly as close as anything.

You can make your arguments about noscript if you'd like (I have a great respect for the project) but I think it was essentially irrelevant to user security at the time, real users were really harmed by malware that exploited Firefox, Java, and Flash, and Chrome killed every one of those attack paths in virtually no time at all.

Computers were far more dangerous before Chrome. You watch old TV shows and it's a joke that people would visit a site and get hacked - that's unrecognizable today, it simply doesn't happen. It used to, Chrome changed that.