Anyone can write five people trapped in a snowstorm. The question is how you get them into the snowstorm. It's hard to write a good play because it's hard to structure a plot. If you can think of it off the top of your head, so can the audience. To think of a plot that is, as Aristotle says, surprising and yet inevitable, is a lot, lot, lot of work.
David MametA play is basically a long, formalistic polemic. You can write it without the poetry, and if you do, you may have a pretty good play. We know this because we see plays in translation. Not many people speak Norwegian or Danish or whatever guys like Ibsen spoke, or Russian - yet we understand Chekhov and the others.
David MametHere's what happens in a play. You get involved in a situation where something is unbalanced. If nothing's unbalanced, there's no reason to have a play. If Hamlet comes home from school, and his dad's not dead and asks him if he's had a good time, it's boring. But if something's unbalanced, it must be returned to order.
David Mamet