I’ve booked several GTY cabins and have never got a “bad” one. In fact most were in very good locations. I think some (if not a lot) are “good” cabins that were booked early on in the release that people cancelled by the time final payment rolled around.
As an example, I have a GTY balcony booked on Ovation right now that was assigned to 8258 which is a good (unobstructed) deck and close to the elevators - a cabin I would have considered if I’d chosen one.
BUT there’s always a chance you could get a lousy location as well.
If the price is right, I’ve never backed away from a GTY..
As an aside, I don’t like Adventure balconies because they’re like sitting behind a steel wall.