Even if you are nostalgic of fan of Homeworld, you will be quickly frustrated by the stupid AI (Including on your side, for auto attack and pathfinding), somehow even worse than in the original. Graphics on this remastered are already outidated. The gameplay is a lot of complex thing which brings nothing interesting. The story is not "amazing" like some says, but very basic.
This is the original game, with the 2 extensions, easily moddable (I personnaly recommande the mod Horn of the Abyss, which contains a HD mod). Don't buy the new "Heroes 3 HD" game on Steam ; it' doesn't contain (and will never have) the 2 extensions, is not compatible with mods (there is a free mod who put the game in HD the same).