Had to reset a bunch of settings, had to say my internet connection is metered to prevent random updates being installed without my permission and I had to reinstall my audio driver to reclaim my signal to noise ratio. (That last one means my audio was constantly buzzing where I had to turn my volume way down to be able to avoid hearing it. Reinstalling the realtek audio driver from their website solved it.)
P.S. Be sure to clean up all dump files it creates, it's in C:\Program Files (x86)\Steam\steamapps\common\Marvel Heroes\UnrealEngine3\Binaries\Win32 or Win64 (depending on your OS).
I removed about 50GB 4 days ago.