To be honest, how easily can you read ai-generated articles?

I mean, can you instantly tell if an article was made by AI?

If it's edited and proofread by a native speaker, No.

difficult to say.

They are annoyingly neutral and boring. They have no style at all. When people speak, there is emotion portrayed by the choice of words and length of the sentences. There are many ways to say the same thing, can be sharp, can be dull, can be emphasized, de-emphasized etc. AI sounds like a used car salesman? You're in the right place! Get what I mean. AI sucks because it has no personal feelings and opinions, it's not fun at all.