The story is told, by a young Magi, Shirou Emiya, who has no experience and very little potential in magic, who is able to summon Saber as a servant. Unwillingly he now has to partake in the Holy Grail wars, with one of the biggest problems is he doesn't like violence as such and he wants to help the world, not fight over some power. He either fights or dies.
Sounds interesting enough sure, and it is. Although it can get a bit boring at times, the story is well developed. The character designs (costumes) are done extremely well with detailed and clear outlooks on how they want their characters portrayed. They have done character personality well though Shirou Emiya really gets on my nerves, for refusing to fight and trying to be all heroic. In some regards his character isn't really believable. There is a vast range of servants with different abilities and strengths which gives Fate/Stay Night some awesome fight scenes throughout the series. Overall a good show that I would recommend you to watch.