adventurous dark mysterious tense medium-paced
Plot or Character Driven: Plot
Strong character development: Yes
Loveable characters: Complicated
Diverse cast of characters: Yes
Flaws of characters a main focus: Yes
adventurous dark fast-paced
Plot or Character Driven: A mix
Loveable characters: Complicated
Diverse cast of characters: No
Flaws of characters a main focus: Complicated
adventurous challenging dark emotional hopeful informative inspiring mysterious sad tense medium-paced
Plot or Character Driven: A mix
Strong character development: Yes
Loveable characters: Yes
Diverse cast of characters: Yes
Flaws of characters a main focus: Yes
adventurous fast-paced
Plot or Character Driven: Character
Strong character development: Yes
Loveable characters: Yes
Diverse cast of characters: Yes
Flaws of characters a main focus: Yes
tense fast-paced
Plot or Character Driven: Plot
Strong character development: Complicated
Loveable characters: Complicated
Diverse cast of characters: Yes
Flaws of characters a main focus: Yes
challenging dark reflective tense medium-paced
Plot or Character Driven: A mix
Strong character development: Yes
Loveable characters: Yes
Diverse cast of characters: Yes
Flaws of characters a main focus: Yes
adventurous dark emotional mysterious sad tense medium-paced
Plot or Character Driven: A mix
Strong character development: Complicated
Loveable characters: Complicated
Diverse cast of characters: No
Flaws of characters a main focus: Yes
dark reflective sad tense medium-paced
Plot or Character Driven: Character
Strong character development: Yes
Loveable characters: Complicated
Diverse cast of characters: Yes
Flaws of characters a main focus: Yes

I think this was a great follow up to Horus Rising and I enjoyed the bits where the story was told from Horus’ perspective. Watching the chosen son of the emperor slowly be turned against is genuinely sad at times, and the fact his men love him so much they are willing to go against imperial rule for him is a testament to the kind of man Horus Lupercal is. I eagerly start the next book. 
adventurous dark fast-paced
Plot or Character Driven: A mix
Strong character development: Yes
Loveable characters: Yes
Diverse cast of characters: Complicated
Flaws of characters a main focus: Yes

I'm not sure how much these books would appeal to readers who aren't at least a little familiar with the lore of Warhammer 40,000. There is a LOT going on in this book. Granted I'm not to familiar with the older lore and the chaos side of things either. I still find the progression of the Astartes and the warp intriguing though and the struggle between loyalties in general. I don't know how long I'll last in this massive series but I'm still pushing on.

I have read some recommendations that after the first few reads there are some splintering paths on which books to read in which order. I'll have to do some more research as I'm fairly certain I'm good to read the third one next for now.