Yes, unless you're on far L or R, generally all seats are pretty good because of sloping floor (so nobody's head will be in the way). The Gershwin is a pretty good-sized theatre, so there IS a distance factor, though. i sat row C mezz, house right, and the view was pretty good. We got canc tix a few nights later for the very last row of the orch and I almost liked those better!
If you've only got one shot at getting in, I would certainly go for the canc line. Unlike the lotto, arriving early matters, so go ahead and show up at least 1-2 hrs before the canc window opens. Sometimes folks unfamiliar with rushing shows will show up early for the lotto when they don't have to, and they see a line (for canc) and get in it. The lotto people have to stay outside, but the box office (for purch AND canc) is inside, so when the staff finally opens the doors, be sure to make a break for it.

Most of the people who HAD been in line will have to stay outside for the lotto, and you can really move up the real canc line during the stampede towards the velvet ropes. lol. Good luck!
"Quien canta sus males espanta." -Miguel Cervantes
(He who sings frightens away his ills)