Actually, you can use the mod that gives you access to the first game's and second game's (Winter Assault) story campaigns/missions. So you CAN experience those parts with better stability (due to it being played on the Soulstorm updated engine).

Where do you find Ultamate annihlation?

Dark Crusade is dead, while there is big tournaments in Soulstorm still. Soulstorm has the best balance amongst all the expansions

whats wrong with vanilla soulstorm