Because vanilla Generals isn't good enough for you.
Graphics are great, the best out there actually, but what puts me off is the gameplay. This mod is aiming for realism, obviously, and I know that, but it seems a bit of a lackluster to me in terms of enjoyment. Nontheless, it adds it's own unique feel to it, with tons of never before seen units and buildings. The models are beautiful as well. It's just the gameplay that isn't doing it for me.