I just got back from DLR today! The Aladdin show was one of my favorite attractions. I arrived approximately 30 minutes prior to the listed time and even after all the priority seating (I know that's the wrong term, but the right term escapes me) people entered I was able to find a seat on the front row. Granted crowds were non-existent. (I waited 10 minutes for Soarin' and walked into Twilight Zone) The only negative to that seat was not being able to fully enjoy the magic carpet ride. BUT--the pros of seeing the performers' eyes and facial expression, and having the animal characters right in front of me made missing that one feature worth it. I sat next to a retired gentleman who was a former teacher of the Magic Carpet character.
I would say, "DO NOT MISS Aladdin!"