Have just recently finished reading the last Murderbot book. Murderbot's "why am i having emotions about real people instead of shows" and general grumpiness remain adorable, and its internal honesty hits buttons for me as well. Plotwise, the book successfully resolves various bits that were set up in the first novella, comes to a solid conclusion while of course leaving space for more Murderbot adventures. Now to wait until *sigh* 2020 for the novel. Suspect I will be rereading these at least once more before then: they're fantastic comfort reads. Bite-sized (well, largeish-bite-sized), with some depth and some humour and some very real pathos.
All four novellas are standalone stories, which I appreciate a great deal. They also build heavily on what's come before. That is, I wouldn't read them out of order, but I don't get annoyed at reading them as they come out. Not unlike the Dragaera books, come to think of it.
Also I would really like a t-shirt for "Sanctuary Moon" (Murderbot's favourite soap opera). My mental image is of a dark shirt with a light/white silhouette image of a domed city and three or four human shapes inside, kissing or sneaking around or some such, and "The Rise And Fall Of Sanctuary Moon" in block type below. Someone should get on this, please.