On our last game, I presented my players the warforged "disguised" to my players. They hadn´t heard of it yet, though. When a player died, I offered him the possibility of creating a "Shadow Revenant" (well, I had to think a name quickly!

). I showed him all the benefits and handicaps of playing one. That player was delighted but the rest were a bit pissed off:
-"ECL+0???!! Come on, man, we thought you were a wiser DM"
-"When I die, I´ll be a "Shadow Revenant" too, it´s completely unbalanced but if you say it´s ok...."
Etc,etc..
Even the player who was creating the warforged asked me to consider making some changes to it...
Then I told them that it was really a warforged from the new Eberron CS and our decision was unanimous:
-It was an amateur job, not what you expect from the
*/sarcasm mode on* top leaders of the D20 industry
*sarcasm mode off/*
-If the rest of the book was as poorly balanced it would only prove our theory that most WoTC are only sold because of the layout and the art.
No one bothered about the warforged not being able to heal naturally, not even the munchkin in the group who simply said: "When have we healed naturally? Perhaps one out of fifty times.....? Come on.."