What is the #1 game of all time? Legend of Zelda: OOT. That's not my opinion either, although it is one of my favorites. If I was creating a game, I wouldn't rip off its design, but it would be beneficial to ask, what are the elements of this game and why do they work?
Character Development (your character gets older, changes gear)
MUSIC
Plenty of Items
Large Overworld
Side Questing
Memorable characters with their own stories (Malon, Saria)
Touching, slowly progressing story.
LOS had side characters, but their stories were all totally intertwined in your own. They existed in the game solely to serve a purpose to your story.
And I say !@$# Combos. What really grinds my gears about LOS is that Gabriel is a MFin super hero, and the enemies are just as strong to balance, and all just to be flashy and keep the attention spans of today's youth.