You should be fine. I've sat in the read mezz before there and have never had any problems seeing. The Ambassador isn't too large a theater so even from the back of the mezz, you're still fairly close to the stage. Not like at the Lyric, where if you're in the rear balcony, you may as well be watching the show from outer space.
"You drank a charm to kill John Proctor's wife! You drank a charm to kill Goody Proctor!" - Betty Parris to Abigail Williams in Arthur Miller's The Crucible