How useful are Marauders?

So... then why does zerg has late tier units like ultralisks and corruptors?
If they'r supposed to win the game on the early stages, they should just have lings hydras roaches banelings and (maybe) mutas.
On the other hand, the tech tree should stop at siege tank with terrans :S

I think you got it all wrong dood, although it's true each race might have a slight advantage at each stage, that does not define anything, and in the original sc, some goliaths could own the ass off any carrier, and the reavers had no chance to well settled tanks/missile turrets...

It all depends on how well you can manage your resources while stocking and pushing, not waiting til late game to attack if you are toss :S

But then again, taht's just my oppinion