We were in the fourth row center and not in the least obstructed. I can't imagine that the third row is worse, and even the first row seemed fine. The stage is not super high but the heads in front of us provided no obstruction. Now, if you are talking about first to third rows on the far sides, you may have an issue with obstruction from some of the set - there is a chair and staircase on stage left / house right, and Aunt Maggie's wheelchair could block those at an extreme angle sitting on house left in some scenes. Center orchestra should be absolutely fine - we were happy to be as close as we were and could see the stage in full.