I too find the "cute" safety briefings appalling. Yet they are very common nowadays. Why show someone putting on an oxygen mask on a beach, for example? The best demonstration of something is one in which the circumstances in which I need to use something are the circumstances in which it is demonstrated. I won't need to use an oxygen mask unless I am in an aircraft so that is what should be shown.
What I want is a serious, business like presentation which reinforces the idea that my life my well depend on me paying attention.