Pretty awesome moment in Animorphs-- this is the first glimpse we get into the minds of the Yeerks. It's got a completely different format from the previous books (there is no 'final' mission, or even a traditional climax), which is unique and interesting. Ultimately I was a little disappointed by the end result. 
 Applegate has always stopped short of showing the true darkness of the world (it is a kid's book after all) but this time I really felt like there was a major plot hold that went unaddressed. (view spoiler)[ Once the Yeerk realized it was not going to escape, there was a period of time during which it could have morphed and stayed in the morph for longer than two hours. There was nothing stopping the Yeerk from striking a final, fatal blow against the leader of the Animorphs. What's more, the Yeerk can read Jake's thoughts, so he could have picked the most horrific, short lived morph available. Can you imagine being trapped as an ant or a flea for the rest of your life? But they never even entertain this possibility. If they did, there would really be no easy way out. I think that's why they never even address it-- if Jake can't conceive of something so horrific, and the Yeerk doesn't really understand how morphing works, maybe his naivete saved him. Anyways, I like imagining K.A. Applegate and her husband having this conversation and realizing they've written themselves into a hole. (hide spoiler)]