Stadium tours are OK, but IMO nothing special. Nothing beats the going to the game experience.... the only reason I can think of taking a stadium tour is if you somehow cant match your schedule to a game thats being played and you want to pick up some team merchandise. Else, I think that only super die-hard fans of soccer will find real interest in visiting an empty stadium.

BTW, I didnt know you could visit the stadiums when there isnt a game on...