The first I-War was a great, great game and it has one of the best intro I've seen, the story of the first is pretty good (does anyone know there is more than one ending?), it was a hard game but I dont consider that to be a bad thing, if it had a quick save option it would have been great because of the already mentioned long travel time.
The sequel was a huge letdown, the plot was nowhere near as good as the first, it didnt had anything good for you to do between missions and I dont get what people say about the 2nd being hard, the moment you get a patcom the game becomes easy. I was always disappointed at how fast and easy you could take out capital ships in the 2nd, mount a mining laser or two and they're dead before you know it.
Freelancer was passable, the problem with it is that like I-War 2 you had nothing to do between missions (yeah, you had those "sidequests" but those were silly) and then nothing to do after you finish the main plot and the other problem is that the modding comunity is like the modding comunity of HW2, "Hey, let's add more ships/systems/guns and nothing else!!!". Starlancer, otoh, was just as good as the first Freespace, a great plot, nice ships, etc, you name it but it suffered from that lousy friendly AI and bugs.