I feel like I wrote this post from time to time on Reddit and I think I'll start this tradition here. I'm. a Honor Harrington fan. I've read several other space operas and they always fall short. The three that came close were Lt. Leary, Kris Longknife and Vorkosigan saga. Lt. Leary was nice, but it failed on World building. Kris Longknife also failed on world building and had astronomical levels of cringe with aliens and plot, but I enjoyed it. Vorkosigan saga had better world building and it was nice overall, but the books without Miles Vorkosigan weren't enjoyable. There were other series that I enjoyed: Serrano Legacy, Vatta's War (those are some of my favorites but they were too short), Starship's mage (it declines with every new book), The Lost Fleet (it has a serious plot problem, the plot doesn't move forward), Old Man's War (it was really nice), Dread Empire Fall (also awesome), Teixcalaan (good, but short), Alarm of War (good, but short and pretty generic), Bobbiverse (I read until book 3, it isn't for me), Red Rising 1st trilogy (really nice, but too Hunger Gamish, this whole dividing society into a cast system is getting old), Ark Royal. The Three Body Problem was awesome and, contrary to most series, didn't leave me craving more after it was over. Edit: forgot to mention The Expanse, it was OK.
I think that what won me over on HH was the fact that she is a complete Mary Sue and other character don't fall far from the tree, there is a nice world building, characters die, and there is a ton of action.
On the other hand, there are some long books that I enjoy that aren't space operas. I really enjoy the Dresden Files (because he is cool and it is a long series), I absolutely love Jack Reacher (it is just a nice fun read, it's like a nice Big Mac), I also enjoy The Spellmonger series, and I enjoyed the Riyria. I disliked Takeshi Kovacs (lack of sequence and plot) and I absolutely hate Southern Reach (VanderMeer), and there is another popular sci-fi book that is written as a report, which I also hated. I don't like those very innovative mystery stories where you are trying to figure out wtf is going on or waiting for a plot to start until the middle of the book.
Got any suggestions? =)
(OMG, after writing this post, I see myself as an incredible hard reader to please)
Two obvious suggestions are Frank Herbert’s “Dune” series, and Issac Asimov’s “Foundation” series.
Both are sci-fi classics (Dune is still the best selling sci-fi book of all time I believe) and are space operas of a massive scope.
They are also some of my personal favorites.
I also immensely enjoyed Asimov's "Robot" books. Three fun little whodunnit's set in an interesting universe.
About four years ago, on a whim I decided to buy the entire Asimov scifi collection (inc short stories which I'm usually not keen on). Really surprised me how prescient and creative he was, considering how long ago it was written.
He has a really 'comfy' writing style, only way I can explain it... trying to read some hard scifi afterwards was a bit of a slog. Like a reading version of wading through treacle.
And he's funny, too!
You always hear about how forward thinking and philosophical his stories were, never how human and alive his characters are, or how he regularly gets a smile out of the reader.
Those are also some of my favorites, the only reason I didn’t recommend is because I didn’t consider it to be quite the same genre, but agree they are excellent!
They are also in the same universe, as foundation makes a few references to that series, which are also fun to catch.