It is not that bad if you rotate the map and make the top of the Sierra the top and Canyon and Eagle lodge the bottom , it makes more sense. Chair 14 is known as the back side of the mountain. They have a phone booth there if you get stuck there.
People have gotten lost but it is their own fault. It is like a big M , you need to zig zag to get from the lowest lodge to the highest main lodge . Take a trip if you are from so cal , you won't regret it.
Oh trust me. I've had tickets the past two years but my schedule sucked. I'm now self-employed and plan to hit it probably twice this year.
My buddies love Mammoth, even after Breck, all Tahoe resorts, etc. They say it's pretty easy to zig zag up and down across the mountain.