What does? When websites use center aligned text for paragraphs.
In most cases, my favorite is justified text. However, sometimes the width of the paragraph is too short to effectively justify. In that case, I use left align.
Why do I hate center align so much? Because it is so hard to read. Our eyes are naturally drawn from the end of one line to the start of the next. When the starting place of each line changes, we have to work much harder to read the next line. Why make it difficult?
There is a place for center aligned text-- usually headlines.