For myself I am holding off on forming an opinion. They have already said that you can play the whole game without ever using it, if you want.

It was hard to track down a source to confirm a half-remembered fact, but apparently the expansion content will be split between a number of mods so that you can independently enable/disable them, including quality:

https://www.reddit.com/r/factorio/comments/16ja44x/friday_fa...

Well, assuming they haven't changed their plans in the year since, and won't in the next few months.

I think quality is fine, the issue is the strings, having "Legendary Wire" in a serious factory game.