Malaysia is divided into two parts: Peninsular Malaysia and Malaysian Borneo. They are very different places. Peninsular Malaysia has the cities, the well-educated English speakers, and the party spots while Malaysian Borneo has the jungles, the endangered species, and the middle-aged nature enthusiasts.
Malaysia’s a cool place. However, if you’re on a tight schedule I’d say skip it. It’s more expensive than the rest of South East Asia and you can find a lot of similar attractions elsewhere.