I gave up on the series after Spectre. Actually I'm not even sure I finished that, but anyway I only read them once and haven't felt motivated to finish the series. Just got tired of what seemed to be a Shatner ego trip.
Ashes of Eden wasn't too bad, but I don't remember enough right now to comment much on it.
"In fact, I've always found that uh...when people try to convince others of their beliefs, it's because...they're really just trying to convince themselves."
Colonel Kira, "Covenant"