It's expected. If you're doing video editing only, then I've heard that a high-end GPU is not as important, as it's really only pivotal for rendering. But yeah, there's a reason why I ditched my MacBook Pro for gaming - it's just awful, whether it's for Mac or Windows.
To put it into context, the 460 desktop variant was pretty much the "borderline" card for PC builds in 1080p gaming. 60FPS here and there, and running pretty well on not-as-demanding games like LoL, Overwatch, etc. But people forget, NVIDIA is really the first company to step forward in its mobile computer division by making it so that for example, the mobile 1060 is roughly 75-90% of its desktop variant. That's unheard of.
AMD? Well, let's just say they haven't had a good track record. The M370X was a rebranded low-end card from several years before that MacBook Pro's release, I believe. I don't know why people keep forgetting this, as AMD really hasn't done anything to improve its mobile division.
So yes, if you're thinking of doing any gaming, especially with current titles, you're only kidding yourself. Stick with a game like Skyrim on the lowest resolutions and play at 40-60 FPS, with 30FPS dips at intensive scenes.
Or, look into either a Windows laptop with a 1060 for less than $2000, or a desktop that you can build easily for less than $1500.
There are pros and cons for the MacBook Pro, but the GPU is definitely not one of them in terms of raw power.