This is the point that the haters are missing. We're using a heavily modified bootstrap with backbone, and it has dramatically decreased our turnaround for new

This is the point that the haters are missing. We're using a heavily modified bootstrap with backbone, and it has dramatically decreased our turnaround for new UI features. Other than the button styles, you can't really tell it's there. To me, bootstrap is CSS boilerplate that is clever and thoroughly tested, so you know when you copy a component or a design pattern from it, chances are it will Just Work. Creating customer-facing sites from 100% vanilla bootstrap isn't ideal unless you are building an MVP or some administration panel where a custom design wouldn't necessarily improve the user experience. It also really raises the lowest common denominator for teams that can't afford a lot of design work. I think bootstrap has been a great boon to web UI in general, and I am looking forward to seeing it evolve and inspire other frameworks in the future.