People hate FW, but more people hate Die, Vecna, Die....

FW's main villain was the factol of the Fated, Rowan Darkwood, who basically started a war in Sigil.
In my "1000 years later" PS setting, I've embraced FW as a chance to shift around some of the comfortable favorites and make some important. I also helped design the system that Planewalker uses to translate the factions into 3e, which, IMHO, is the best way to do faction powers; more flexible than PrC's, and more integrated than templates...
Faction War has a bad rep, basically. A lot of fans see it as the "nail in the coffin" for Planescape, because it was the last real product for the setting. They saw it as TSR trying to kill off the setting (versus just letting it die like the other 2e settings.

). Perhaps it's a little aosiXtect of me, but I welcome the change it brought.
It has cool potential. I actually like the Mind's Eye enough to keep it around, because I don't think that the Sensates or the Signers loose anything by joining up, but gain a very interesting synergy. I kept the Doomguard as a marginal sect (they do the whole "terrorist cells" thing REALLY well, and I figure they would welcome their own entropy). Made the Sons of Mercy (aka: The Wussguard) a little bit more hardcore, made the Sodkillers more philosophical ("Survival of the fittest!"), added some jazz/blues/bebop flavor to Sigil, promoted the Escathon, and just had fun with it. It really allowed every DM to make the setting their own in a powerful way.
Not that, you know, I wouldn't like some resolution to this dangling thread...just that I think at this point, most people would not like the resolution as don't like FW right now.
