Having ushered for Assassins for the second time last night, I can honestly tell you that any seat on the Mezz including the last row NN has a great view. They have been sold out for the past several perfomances, so you'll probably need to do Rush, or even a General Admission ticket, which gaurantees you a seat, it's just not an assigned one & you're seated right before curtain.
But do what you have to do to see it, it's definitely worth it.
It's hot and it's monotonous.
I want my glasses.