Harold Pinter's "The Birthday Party"

Pinter is a unique writer: his style stands out, and you always know when you're experiencing one of his works. "The Birthday Party," I believe his earliest play, features many of his bigger issues: odd power dynamics, absurd situations (and as importantly, absurd human reactions to absurd situations), emphasis on language, particularly the difficulties of communication, the inanity of everyday conversation, and again, the absurdism in language. I wonder, though, just how many Pinter dramas it is necessary to read. Do I need to read both "The Birthday Party" and "The Dumb Waiter" to get the point? Granted, his screen treatment of The French Lieutenant's Woman shows versatility, so I guess there's no reason not to keep barrelling through his works.