When I was 15, Wing Commander IV was the best game I had ever played. The FMV was, and still is, the best of any game from that era. The space combat is exhilarating even today. Dogfights are fast paced and dangerous, unlike the plodding battles and clunky mechanics of other space sims then and now.
The game still ranks way up there, but it's not even close compared to the other WC games. Wing Commander IV did a really crummy job conveying to the player any motivating reasons to defect. On my original playthrough, I didn't even realize the *rescue* of the bio-convergence scientist was a kidnap job until Blair said so in the final debate with Tolwyn! I found out all the nasty SRA/Project stuff long after I had already defected, and most of that only in the final missions. Before defecting, all I really had to go on was that Seether was some kind of psychopath in Confed service, that Paulsen fired my war buddy Eisen from his command because he had been snooping around sensitive fleet records, and that Confed began shooting down ships that flew the opposing flag in its territory. In fact, the Border Worlds actually were the provocateurs, declaring independence and invading Confed airspace with cruisers. I didn't even understand why I was defecting. And then on top of it, we are forced to defect or lose the game, torpedo our own carrier, and fly missions in support of the KILRATHI! I'm sorry but I'll take Hawk's side on this one. If my home world had been proton bombed, I'm not sure I would care to help Melek find a new place to call home either. When we actually take on Confed again, we do so by participating in a muddled proxy war, stealing a carrier undergoing refit, raiding fighter production facilities, and attacking a lightly protected communications base. Who knows how many honored veterans of the Kilrathi War we actually killed in our two week stint as pirates? At least we meet Pliers, Panther, and Hawk, which makes our time on the Intrepid at least somewhat tolerable. But then Vagabond dies! Catscratch dies . . . I think. And Maniac is given nothing to do for the rest of the game.
That being said, I still love Wing Commander IV. I just see it through different eyes now.