It's hard to explain the story without spoiling everything. There is no main plot explained to at the beginning of the game; you are just a group of Desert Rangers who journey into the wasteland to kill shit and sometimes help people - suggestions of some greater machination occurring in the wasteland are picked up from the people you encounter during your travels.
The game is easy to get into for an old-school CRPG.There is little to no stat-juggling, and the death system is very forgiving. It has an interesting combat system, a hybrid between isometric and first person. Combat choices occur in first person, but you can move your characters across the map while in combat. For example, say you have two dudes with assault rifles, and two dudes who brawl; you can can have the two gunners stay put and shoot, and at the same time have your two brawlers use their turns to get into melee range.