Onyx Storm: should I do this to myself?

Onyx Storm is out. Back in June, I ate books 1 and 2 of the series like ice cream on a hot summer day and rated both 4*/5. The problem is that this new book is huge, and 4/5 is not a very high rating for my blog. More like meh. Where do I draw the line when a series is interesting but flawed with plot holes bigger than TON 618?