For those that know the show, and those that care...
I sat 3rd row and I am average height. I could not see the stage(floor) at all even when the part in the middle is raised. You can't see the groundrow at the back (the jagged thing that changes colour) and you cant see feet & shoes.
Although, the fact that you are so close and can see the intricacies of the costumes makes up for it.
Personally If i ever get to go back, I think I will go for a seat in the Mez because I love to see the stage and the traps working when I see a show.
http://www.flickr.com/photos/27199361@N08/ Phantom at the Royal Empire Theatre