Yes, I am recommending them, look at the scores.
House of Suns is the usual realistic and very interesting sci-fi by this author. Its a standalone work (not related to his Revelation Space universe). AR remains my favorite contemporary SF writer. What I like most is that he is unpredictable, you have no idea what will happen next (most of the time). Another strong point of Reynolds is realism and I am not meaning the technology but mainly the choices and reactions of his characters. They are clever. In many books the characters are just plain stupid and do not think at all (especially the antagonists) - it kills the plot.
One book I gave up quite recently is The Descent by Jeff Long.
Would you go exploring in an underground cave on your own? I think not. Yet, this is what happens. Not only that, the main character (of the first 50 pages) goes on until his batteries run out totally, several hours into the cave. Yeah, right.
Morningstar is a good fantasy piece, but nothing extraordinary. It is a bit predictable, but saved by the attitude of the main character (not the narrator character). And yes, in the final battle the group splits up with the predictable disaster following...
The Dark Beyond the Stars - maybe I should have scored this as 5/5, it is a tale of a generation ship on a voyage lasting thousands of years. The frailty of human life is one of the main topics. There are some logical errors in this book though and that detracts a bit (like people going exploring on their own on a dangerous planet - that's just plain nonsense).
I really do not like spoilers, so I cannot say more about them without spoiling the fun. I dislike reviews that detail / reveal plot elements. If anyone wants to know more, there are plenty of reviews on Amazon (with the usual spoilers). I prefer just to start a book based on a recommendation / author or just the title and cover.