It is passive as hell. 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 Bd7 5. Nc3 Nf6 6. O-O Be7 7. Re1 O-O? is probably the opening trap that needs the most moves to justify, but Black should let a pawn go to avoid losing the exchange.
That being said, the opening is not that bad. It was played by Stenitiz, Lasker and Capablanca. White keeps a space advantage in the center and a stable advantage, but converting it is not always easy.
This variation of the Ruy Lopez has fallen out of favor since World War 1 because it is viewed as "weak." Can anyone explain for me why? What is white's best way to capitalize on this intrinsic weakness?