I have to admit that I'm with the others who are bored with LMA but still like Indy for what it is. Not sure exactly why that is, but there are a couple of things that I think affect the experience for me. When Indy starts, the arena is nearly enclosed which is great not only for the ambiance but also to escape the heat. I seem to always catch the LMA shows when the sun is completely baking the crowd.
The Indy show also seems to have a lot more going on. Is is just me, or does it seem like there are twice as many cast members involved in the Indy show? I realize many of the LMA cast are behind the scenes, but as others have said, LMA has too much downtime that is filled by fluff. Even though Indy uses the same gag with guests every time, it's still entertaining somehow!
Finally, I guess a car stunt show isn't for everyone, just like the movies that they are used in. I couldn't care less about movies like Fast and Furious, so I guess it's not surprising that LMA holds very little appeal for me. Indy is much more generic when it comes to movie stunts, which might interest more people and even those who aren't necessarily Indy fans. No offense meant to those who enjoy LMA, just not my cup of tea.
Maybe two stunt shows are simply too much in a park that already seems to be full of shows in general. It can make it hard to catch it all in one day, although it doesn't necessarily make me feel like I really need to come back. Either way, LMA does eat a fair amount of people who would otherwise be in line for the big three at DHS, so I'll take it for now.