I would love a movie, in fact I spent a lot of my time as a kid imagining a movie. Visualizing those fights from the books. However, here are my issues.
Firstly, I feel some of the content of 07 and 06 would be cut out due to Lego's demographic of mostly children. There are certain things that books can get away with that movies cannot. For example.
"When Avak went to check on the situation, all he could find of the Toa were bits of armour, a mask that looked half devoured and puddles of something that Avak would rather not identify"
These scenes are pretty graphic, even for a book. But I feel very strong scenes like this make you remember the characters. At least you can cut that scene out, I'd rather keep it in but I doubt it would stay. Some are a lot harder to avoid like the defeat of the Nuva, you cannot cut that out completely.
Also something that BH couldn't help but do was make the characters simplistic by turning them into clowns. After reading the book I was very disappointed that the Piraka didn't maintain their personalities. Just hurt themselves then making monotone grunts and growls. However, I don't completely hate the game, Piraka playground was a lot of fun putting scenarios together. Avak, Reidak and Thok walked into a bar...Zaktan's mismatched his antidermis mixology and they died of poisoning. The end. : P
Back on this, an example that they did this in the movies was both Nidiki and Krekka, also Tuma where they failed to be threatening despite their reputation in the books.
Sorry, I just finished writing an essay, also I'm very passionate about 06 lore... XD