It's a great game. The 1st (adventure game) is available as a free download for OSx. I replayed it a year ago, it was so much fun.
Categorizing Dune 1 as an adventute game is a little to simplistic IMHO. The way it gradually morphs from an adventure game into a strategy game is one of the most enjoyable and unique gaming experience I’ve ever had. And is a large part of why I remember this is one of the best games ever made.
Absolutely do play it through if you haven’t.
This game had so many great moments. One that pops into mind is sending Fremen units to attack a Harkonnen base and they would literally start marching towards them on the map. Another is how the NPC's eyes wound randomly bulge when you were talking to them.