If you're not on a aisle, leg room at the Rodgers is pretty limited in general. I haven't sat in the front orchestra, so I can't speak to that. But I have sat in the "stadium seating" area of the back half of the orchestra. The sight lines are great, because you can clearly see over the person in front of you, but the leg room is lacking.
I have sat in the boxes, and they are very roomy. As LushyBear said, the seats are not fixed, so you can move them around. However, it is partial view, and if you're in the upper boxes, you're looking down on the performers' heads. So I recommend the four lower boxes only. And it will be tough finding boxes in Ticketmaster.
Another option for a tall person is the first row of the REAR mezzanine. That row is behind a railing, and a curtain hangs off the railing. So you can put your feet under the curtain and have all the leg room you need!