Better in what sense?
1. It’s simple, charming, and nostalgic.
2. I view it as a defense mechanism against the onslaught of modern gaming that’s locked in a race to the lowest common denominator (i.e. “Stay away! This game isn’t for you!” ;) )
Because your phrased your question like people that complain about the level of detail. Yes, factorio is ugly (although some trees are beautiful). And yes, that's a design decision.
There are some mods that reskin it. Personally, I don't think any of them are beautiful.
Any chance you have the game set to use 16-bit color?
Terrain looks better, trees look better, too, I think it's a pretty big change.