BTW - Thankfully the Oakland Stadium is a one of a kind in baseball. I suppose I could have posted a picture of the Big A or Kaufman Stadium if we wanted to see a better looking stadium with ample parking. probably Chavez Ravine. That said, for the most part, big surface lots are just a waste of space in urban centers.
Camden Yards works OK because a lot of the parking is under 395, it shares its parking with M&T, and it is on the fringe of the downtown. Honestly, what development or neighborhood improvement has it generated south and west of the park? I'll leave it to smarter people and urban planners, but it looks to me to be more or less a hard border to Pratt Street and the inner harbor rather than a stimulus for development on all sides. My guess is DC wanted something different, much closer to what happened between Penn and Mass, with the Phone Booth as its center. It did not happen right away due to the 2008 banking crash and the real estate bubble, but it looks like it'll happen in the next 10 years given the building going on.
I think what will end up is probably a good balance between car access, which works for larger groups, and alternative access (pub trans / walk / bike) for smaller groups and those closer to the stadium. not to say that there might be a pinch while the build out goes on.