Wow, flop is a bit harsh, isn't it? Considering how many people actually love the park?
True, it's not in your face Disney characters - thank goodness.

But it showcases the beauty of Disney in the details. AK is so thoroughly detailed that it takes my breath away. Have you ever noticed the little footprints in the walkways? It is a totally immersive experience without the over the top merchandising.
I do hate how hot it gets (and that there aren't that many places to escape the heat) - but it's part of the atmosphere. The jungle isn't necessarily a pleasant place. Epcot gets pretty miserable in the summer, too. I usually don't spend much more than a few hours at AK, but it is always something I look back upon fondly when I'm home from my trip (and no, I don't live anywhere nearby).
The evenings that I've spent in AK for EMH have been awesome. When the sun is not beating down and you can take the time to appreciate the park.
I'm sure it's not for everyone, but it's hardly a flop. And I happen to LOVE Dinosaur