TIE Fighter is generally known to be one of the best, if the best, space simulation games; I personally can agree with a lot of that opinion (especially in term of story and flight mechanics). There's an added degree of difficulty, though, due to the titular ship you end up flying a lot of the time. For me, this translated to a lot of mission retries, even on easy, and often not of my own fault; mid-air (mid-space?) collisions are a fact of life in this game. Frustrating, yes, but worth it.