If it wasn't WCW and ECW vs. WWE? The two needing to join forces made them look weak.
I think they went wrong when they turned Booker T and Shane McMahon heel. People were into Shane as a face, and Booker T as his WCW Champion was something that people actually seemed eager to see. When Booker attacked Stone Cold Steve Austin and put him through the announce table in his WWE debut, the fans went pretty fucking crazy. Austin was a great heel at the time, and he just needed a top face to go against him. Booker T could have been that top face, and a feud over who the "Real World Champion" was could have been what the WWE needed to kick-start the Invasion with some credibility.
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