TL/DR: choose 'best in show' accounts for each conflict instead, like Blackhack Down for Somalia. More reading for each, but you will come away satisfied.
My rating may be overly harsh, but it was my 'present sense' sentiment on finishing. I went back and forth between 2 and 3 over the course of the book.
My greatest complaint about America's Splendid Little Wars is that the book is very uneven: it seems almost as if Huchthausen had to go back into American military history as the publishing date neared to find more 'little wars' to balance out the timeline, or maybe missed some stuff and had to scramble to get it written out right before the book went to print. Case in point is his coverage Mayaguez incident, which also supports the larger point about evenness. The chapter is a rushed narrative, without significant pre- or post-historical context, and a very tight policy lens: a fuller assessment of its significance in the face of the recently completed Fall of Saigon and early 70s Vietnamization policies would have been helpful. Contrast that against sections on Panama and Somalia, which have robust discussions of the run up, America political environment, in country histories, interactions with the USA, et cetera.
Another significant problem is the unevenness of military maneuvering discussions - sometimes Huchthausen describes details of the action (e.g. Just Cause). At other times, he's inexplicably high level (Desert Storm, Gothic Serpent). Bosnia and Kosovo are almost entirely political discussions...except for accounts of Serbian and Bosnia Serb maneuvers. As a result, you won't learn a thing about the 'Highway of Death' or the accidental bombing of the Chinese embassy during the Balkans conflict. Clinton's response to Bin Laden's first provocations? Huh? Fugghedabowddit...and this is poorly washed away with a literary shoulder shrug at the end about what he could have and chose not to cover.
All that said, America's Splendid Little Wars is kind of like of a collection of Wikipedia entries, so I won't recycle the book immediately (I may change my mind as I add better accounts of each conflict).