well, i only had gears of war 1 PC, which was buggy as hell. but this is the general storyline:
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it didnt have one. you were rescued on lierally the suppsoed last day of the war, and you had to get some information in the tunnels to plant a bomb froma train. you did, game completed. for some reason you went to marcus\'s house, in which there is a lab(never explained) and there were some hints that his dad started the war (never explained) you went through the cities, found some people called the stranded(never explained) and Doms stated he was \"looking for somebody\" (never explained) there was fuel source called emulsion (never explained) and that figured in some way.
if you read any of the reviews you would have heard how the hollow(centre of the planet) was found to have emulsion, some uber fuel, in and that started a war between the humans. then the locust came out of the holow and attacked. now, i dont now how they knew this, cos all you get is the manual telling you that on E-day when the locust emerged, lots of humans died, and the rest whent to a place where the floor was made of rock, so the locust couldnt burrow up. somehow they did, marcus\'s dad died. he tried to save him and got imprisooned for disobeying orers.
howewver, it was a dman good game, best ever in fact, apart from number 2