David Weber..Honor books...first was good to great, but I kept wondering at the end 'Why is this bitch killing her troops and why is the stick inserted so far'. Two through four, same. I then switched to library copies. I literally quit the series on the Royal Michelle spin off, because there was so much noise and internal debate I gave up. I also tried his space vampire book. Weber sucks as of now, there was no reason for that book other than lazy greed.
Heinlien...loved the children's books as a kid. Read his adult books, Friday was okay, even with the sex. The rest were great writing and sick sex. If a ⌧ mag wrote half of what he did, I would support jail for the publisher.
Ringo, great writer until he got bogged down in the scifi war series. His hero SEAL series is the modern Nick Carter, with too much BDSM.
I really really like Asmoiv's murder mystery club, and robot cop. Foundation was okay for book one, and got way too bogged down after.
Kratman, good to great writer, on the edge of great, with too much right wing (I tend that way, but he uses the hammer when a light touch would be better)
Drake, writes hopeless burned out small unit mil sci fi very well.