First of all.
These videos of yours shows nothing at all. Running menu is significantly less HW difficult than actual gameplay. And even then its not much comparable, because FPS really depends on the resolutions of the monitor you are using. ( Higher resolution means more pixels for Graphic Card to render )
For example the monitor used with old Mac is definetly not 1080p, so its not comparable with your others videos.
Plus the Classic client is not on the battle net launcher. So I guess you can play it only offline now, because the old servers are dead.
The game may be unplayable for some for many reasons. One may be that the new graphic is not very optimalised yet, so the slightly older computers will have hard time running it even tho they can run high settings on Starcraft 2.
Other reason may be the solo buggs that are in the current game. Sometimes it just kicks you out of the game whenever enemy leaves. It happened me in three games in a row when I played with a friend. Also there are numerous GUI buggs. When you join a game sometimes it wont load the lobby and you have to do that again. etc. etc.
But the thing why Warcraft 3 Reforged is a trash game is much more simpler.
They developed this game for more than 2 years and all what they have done is just graphic redesign and creating many buggs in the process that werent there in the original game. They released it and they are playing dead buggs now.
Im sorry but if you work on something for more than 2 years, it should have some quality, especially when the developer is billion dollar company like Blizzard.
And the argument about the price is just nonsense. $ 30 may seem low but it cannot be compared to work hours, because its lowered by most consumption.
Plus if I may add something.
I just remembered another GUI issue. Whenever you load a game, the map is definetly not in 4k… its wierd as hell to look at the pixels in the middle of loading screen.