Whether you’re writing an article, short story or novel, be careful of your paragraph lengths, especially your opening paragraph. If a reader is faced with a big block of words, it can be very off-putting as can page after page of long and lengthy paragraphs.
It’s good to have a mixture as this aids readability, though it depends on your market. For example, the women’s weeklies all use fairly short paragraphs. The best way to get it right is to check the publication you’re writing for and to see their preference.