Tiberian Sun is an excellent sequel to the original.
Tiberian Sun is set decades after the original C&C (Tiberian Dawn), and the world is in a worse state than when we last saw it. Tiberium is spreading like wildfire, and most cities and homes are in ruin as civillians retreat to the more habitable parts of the world due to the poisonous nature of the alien life draining mineral. The Earth itself is decaying as Tiberium is slowly leeching the life from it as it spreads. Despite all of this, Nod prepares to make their grand return once again lead by the previously thought dead Kane, and GDI forces lead by General Solomon aboard the space station Philadelphia find themselves plunged into yet another war.
Unlike the other games in the C&C series players take on the role of a particular character in the campaigns. In the GDI Campaign you play as the arrogant, and victory loving Commander Michael McNeil. In the Nod campaign you play as fanatical, and tempermental Commander Antan Slavik. This can give more depth to the main character as unlike the other games where the player themself was the Commander, preset characters with some sort of story are the Commanders. Unfortunately there is little character development in the GDI Campaign, and even less in the Nod one which makes one wonder why they even bothered. Regardless the storyline is solid, and flows well for the most part, and all of the characters are likeable in their own way.
The gameplay is exactly the same as it was in the original C&C, and Red Alert. The poisonous alien mineral Tiberium makes its grand return, along with a newer, and more valuable Blue Tiberium, and Tiberium Veins. There are also new types of Tiberium Lifeforms to be on the lookout for, as they can do a lot of damage to your forces, and your base if you're not careful. GDI Tanks have been replaced with Mech-type units, and the units and buildings overall have a more sci-fi feel to go with the apocalyptic setting of Tiberian Sun.
The graphics are an improvement over the original C&Cs and Red Alerts. Infantry are still small, and cartoony, but the terrain, buildings, vehicles, and colored lighting are a definite improvement over the feel of the original. The world truly does feel as if it is in a depressing state while you're playing the game. The audio adds even more to the atmosphere.
The sound is as you can expect from a C&C game, and the voice acting and acting are better than the first two games' for the most part. The music is once again composed by Frank Klepacki, but it takes on a more gloomy and depressing tone to fit with the like setting. This disappointed many fans, but it improved the immersiveness for me.
Command & Conquer: Tiberian Sun is an excellent sequel to C&C, and Red Alert. It places focus back onto the GDI and Nod conflict (which hopefully won't be ruined in the upcoming C&C 3), sees the return of Kane, and has a very immersive (though depressing) setting. It's a must play for fans of the series.