That's not true.
It depends a lot on the OS and what you're doing. If you're using Ubuntu, the NUC would be faster for most tasks because the intel graphics card has nice drivers and the (integrated) graphics card is faster. So flash videos would run much better. Also, per core, the NUC is roughly just as fast. Maybe a little faster. Most of the time you are not using all cores.
Here's the CPU comparison between this NUC and the fastest Macbook Pro CPU http://cpuboss.com/cpus/Intel-Core-i7-5557U-vs-Intel-Core-i7...
Finally, both NUC and Macbook Pro are really bad with games. Macbook Pro heats up like crazy even when sitting on an aluminum cooler just watching Netflix. Playing games is another story. Very few are supported and even fewer are optimized for OSX. On the other hand, the NUC just doesn't have the discrete graphics card required.
If you are OK with the form factor and aren't running multicore simulation most of the time, the NUC is a better choice.