The Spice Must Flow! I loved the original story (even though not the endless franchised series been constantly ghost-written as you are reading this). However, one needs not be a Dune fan to enjoy this wonderful game!
Emperor: Battle for Dune the graphics may be quite dated today, almost at par with C&C:Generals. On the bright side, they will truly shine even on currently low-end machines or tablets. The units are well designed and clearly visible in any zoom-level - something surprisingly rare even in new games (such as Supreme Commander) in which one can either zoom-in or play. Plus, the battlefield view is rotatable, another feature I miss in many new RTS games. I especially enjoy the way the buildings come up and the targeting-lasers of the snipers as they move around.
If this is not the the best strategy game, it is definitely well within the Top-5 all-time RTS! Well balanced gameplay (if you liked C&C: Tiberium Wars, you will love Emperor: Battle for Dune). A Solid story-line, interesting videos and random environmental events (sand-storms, worm-attacks) to keep the field level in the name of Shai-Hulud.
Sad but true, greedy lawyers and bean-counters have taken over the gaming business. True game-designers, the likes of Westwood Studios, are pushed around - if not entirely out of the picture.
I bought the game some years back but still take it out once in a while. They just don't make them like this anymore...
Get it for the nostalgia. Experience it for its polished gameplay.