I have my Raspberry Pi B+ hooked up to an HDD and serving my media successfully. I never hooked it up to a TV as a media centre since I wasn't to convinced on the device's strength to do this reliably.
Not knowing much about the W10 IoT, I would like to know if the PI2 is up for the task to stream the data from my B+ model and play back 1080p content without stuttering (provided the network can handle the bandwidth).