Multi-core CPU's aren't just about horsepower and processing ability. If the OS and applications are developed to correctly use the processor cores available, you can see massive improvements in battery life, heat, multitasking etc as well as sheer number crunching.
For instance, if you're just tinkering with settings, checking email, that sort of light use, the OS can shut down three of the four cores and still offer a good experience, but with a massive reduction in battery life and heat. Do something more intensive and other cores are brought into life to cater for it. If the OS supports it, you can also have different threads running on different cores to spread the load and ensure one App doesn't hinder the performance of any others. Background tasks for instance run on Zero, leaving the other three for foreground applications.
So four lower power cores (in terms of clock speed and voltage) can improve all areas over and above single and dual-core processors.
It's not all about horsepower