Family atmosphere. I can take either my wife or kids and have a good time.
No drunken idiots. Don't underestimate how bad an experience these guys can create for everyone around them.
Clean. The stadium is pretty clean - even throughout the game. The absence of multiple puke zones is nice.
Easy access. Drive up on wide roads to large parking lots and a short walk. Sure beats hours of single lane traffic at some venues.
Gas/food/stores close by. Nothing worse than an isolated stadium.
Close to BYU. No remote stadium issues with decreased student access like some schools.
Setting. It's hard to come up with a better setting, including both scenery and overall weather.
It's BYU on the field. That alone completely elevates LES over any other venue.