They're a life saver. This is 2017, the least we can ask is that people take the time to use bold, italics, bullet points, tables, hyperlinks, and type faces to make their communications more cogent.
If you mean that "abuse of HTML" is an abomination, then yes, sure. But light use of HTML is extremely important today and my opinion of someone trying to communicate an important piece of information to me is directly related to how much care they have put into composing their email.