Power-point is a powerful tool but when teachers are observed by inspectors it is sometimes used, to teach through, rather than to enrich the lesson.
The worse example I have ever seen is when a teacher read the text of his lesson from the Powerpoint, students conscientiously copied the text, and if that was were not enough, students were then handed out a copy of the presentation .To the inspector this demonstrates both lack of confidence and poor communication skills.
However when power point is used properly e.g. to pull down examples of ethical advertising from the internet ,or to show a graph of the movement in house prices during the last 20 years, or as a modelling exercise in a cash flow document, then it works well to increase the interest of students and encourage debate and discussion.