I just read Swamp of Secrets and it was great.

The Toa were all perfectly in character (Onua's running joke of showing up to save people at the last minute continues unbated) and the new Makuta were very cool. I particularly enjoyed Krika, A.K.A. "Clover."

The Bohrok cameo was also very interesting. I never would have imagined that they were created the way they are... It's very unsettling and fitting. (I'll give you a little hint that's a quote from the first Comic 8, bolded for emphasis: "You dared oppose your brothers! Therefore you must fall! Mata Nui will be cleansed!")

Also, had this been a movie, there are a few parts where I would've most likely cheered and such. (Like when Onua picks up a friggin' Makuta and slams it into the ground with his super-strength.)