As much as people bash the melodramatics of Wing Commander IV. It is still one of the greatest space flight sims.

User Rating: 10 | Wing Commander IV: The Price of Freedom PC
With a bigger budget than in Wing Commander III, Chris Roberts was able to weave a tale of intrigue behind the traditional Space Sim. While not on the scale and grandeur of the epic battles in Wing Commander III, it definitely has better production values and improvements in many accounts (in particular cinematography and story telling). It is by far the deepest stories in the Wing Commander universe, and is my personal favourite of the entire series.

Wing Commander IV branches from WC3, in that you're efforts leads to the "opposing" team to the Confederation and fight along side the Border Worlders against the tyranny of Earth. By far the most interesting addition to the WC universe is the inclusion of the Black Lance, basically the elite special forces of the Confederation that does the dirty work for Admiral Tolwyn, i.e. genocide (via bio weapons), attacking unarmed transports. Each faction's ships/planes are well varied and really adds to the scope of the game.