There are some articles that I think are written so fast and then published without any proof reading being carried out and so the grammar, punctuation, spelling is very poor. I think these are the hubbers - a very small minority - whose sole intention is to try and make money rather than writing for the benefit of any readers. These hubs are appalling.
I think though that there are also quite a few hubbers who are writing in English and it's not their first language. This can be very hard for them and so I never usually flag these hubbs. There are other people who enjoy writing and are trying to improve their skills. Many will tell you that they are also trying to improve their grammar, spelling and punctuation. Even in the 21st century not everyone has had the benefit of a good education and this can be for a variety of reasons. So I honestly don't think that all hubs that display poor writing skills are necessarily written by people who are lazy or ignorant - many of them are trying to learn and improve.