I've tried so hard to like MPC-HC but in the end I just don't. Unless you have odd codec requirements, what usually works much better especially on lower end hardware is Windows Media Player plus Haali Media Splitter and ac3filter (the latter for audio codec support), as long as that lower end hardware supports hardware H.264 decode. Once you start running alternate video codecs, that's when you start having problems. The H.264 decode with Windows Media Player is actually one of the smoothest, and works well with lots of hardware. Luckily Windows Media Player still remains in Windows 10. Most of my files fail in the Win 10 default video player.
Similarly, the Win 10 Photos application kinda sucks IMO. The UI doesn't really make a lot of sense IMO for a desktop, although it's probably OK on a tablet. I'm not a fan of Windows Photo Viewer either, but it's already there and usable on a desktop (and laptop). I have also installed IrfanView for light edits, although IMO it has a dated UI.
I am using Edge, just to get used to it, but when I get frustrated, I go back to Firefox. However, I'm convinced Edge will improve quickly, esp. when it gets plug-in support.