Only for my Sox, would I sit in a seat smaller than the smallest airline seat with a pitch designed for someone roughly 4'10" for 6 hours, pay $50 for the privilege and NOT be able to see the batter.
Baseball - BORING AS ALL HELL when you can't see home base or the batter. Had this been my 1st trip ever to Fenway, it would have also been my last.
When the tickets say they're obstructed, they're not suggesting that you might not be able to see a tad bit of the field. They mean you're going to miss vast portions of the game.
May I suggest NEVER buying a ticket in Section 20 seats 1 - 6ish, any row?