What would you think of a blog that has few grammar mistakes?

To be honest, I pay attention to content rather than grammar so if the message is clear and understandable then I wouldn't even notice them; especially if there are only a few of them.

I agree with the experts answer. Thanks for the invitation. 

Well, that's good! That means the writer is quite keen on keeping his/her work presentable.

I think that the author of the blog is someone who has no attention to details, and has poor communication skills.

I think that has to be learning from mistakes even learned well