I never played Command & Conquer because of their multiplayer. I played them because of their single campaign, of their story. Kane's Wrath has one! An exceptionally good one!
This expansion aims to connect the previous Command & Conquer game, Tiberian Sun, with Tiberium Wars. While the game offers new missions and cutscenes, one downside is that we only have one new campaign this time (I guess the developers ran out of both money and time to complete the rest).
You have new units, as usual, and the missions are a bit more difficult this being an expansion pack. This is normal as the creators always assume you've played the original one.
Honestly? I don't remember much. I remember it being good and I remember that Kane could deliver once more. It was a decent expansion - you may not remember this word as in the gaming industry we have DLCs everywhere today.
Highly recommended along with the vanilla game.