opponent matters so much in attendance figures, so those stats don't really impress me to much. If this years O's series had 38% more attendance than last years O's series, and this years Red's series to last years Red's series had a similar increase and so on, then I might be impressed. Of course this method has flaws too (weekend versus weekday, weather conditions, month of the season, etc.).
My own opinion, our attendance has been pretty bad so far, the numbers just look good b/c we have already had home weekend series against the O's and Phillies.