What I meant is that the war as depicted oneshot in SC1 could have feasibly been expanded into an arc spanning multiple games. The period depicted in episode 1 where the three sides fight over terran space could have been expanded into multiple arcs spanning multiple games.
Instead Blizzard just breezed through every possible plot point that the writers had world built at that point, forcing each game to basically make up a bunch of new stuff to keep the story going.
I agree with you that it works better as a standalone and that the sequels were unnecessary. On the other hand, I still think it suffers from being an RPG/movie/comic plot crudely transplanted into the RTS format.
The common problem I see in the Blizzard RTS titles is that they're telling RPG stories rather than RTS stories. RPG stories are better suited for much smaller scales than the ones in RTS games. RTS titles are better suited for political thriller and military fiction, which have a different set of standards than your typical drama.
In SC1, the myopic focus on the four recurring terran characters (Raynor, Duke, Mengsk, Kerry) comes at the expense of the greater terran, zerg, and protoss organizations. A successful rebellion (as opposed to "silly humans infighting, leaving them vulnerable") doesn't fit with the two alien invasions going on. The zerg focusing all their efforts on Kerry Sue doesn't fit with their shtick as an aggressive hegemonizing swarm hellbent on eating everything.
But, again, hindsight 20/20.
There's a bunch of new Warcraft clones in development. Amber, Liquidation, Edge of Chaos, Immortal... I'm keeping my eyes on those.
Sadly there's no scifi RTS titles that capture what drew me to Starcraft. Honestly, space marines vs aggressive hegemonizing swarms vs Tribal-Wizard-Warrior-Poet-Scientists is not a premise unique to Starcraft. Atrox, Natrolis, Starfront, and Helldivers all touched it. Not to mention there are a bunch of games about bug wars in the vein of Starship Troopers.
The three race thing is basically Starship Troopers plus a third side. Ancient aliens, white angels, sapient robots, whatever. Even Aliens vs Predator counts.
There is an SST RTS in development, but it doesn't look like the bugs will be playable. Sadly.
Speaking of SST, apparently the Roughnecks cartoon gave them the ability to engage in gene splicing like the zerg and tyranids do. Between that and the addition of the God Bug, the Pseudo-Arachnids are now pretty much the pre-Kerry zerg but without the personalities that characterized the Overmind and cerebrates.
We live in strange times if the Pseudo-Arachnids are better at being zerg than the actual zerg.