I was in Boston for the Ontario long weekend and I attended two games at Fenway Park, both Red Sox walk-off wins. Both wins came at the expense of the Detroit Tigers whose bullpen was exposed in these games after Jose Valverde had to throw over fifty pitches on Friday to nail down a win for the Tigers.
Obviously Fenway Park is a busy place, they have had over 600 sell-outs in a row. The aisles are narrow and the seats are small as you would expect with an old park. There are obstructed seats back in the grandstand so you have to be careful in ordering tickets. I went with tickets from stubhub and they are not cheap, you have to pay around $120-$150 for a decent seat.