Shadow's story was the weakest of the trilogy. It attempted to portray Laura as a villain for doing basically the same thing she did in the previous two games, resulting in a ham-fisted morality lesson that collapsed under its own ineptness. The gameplay was slightly worse than Rise, largely due to its inclusion of far more scripted action sequences (returning predators, teamwork with an NPC, etc). The worldbuilding was easily the best part of the game, and any future replays will be solely focused on revisiting the game's beautiful Mayan architecture and reinterpreted myths.
In summary: It's a weak ending to an otherwise solid trilogy, but it has enough of its predecessors' spark to merit at least one playthrough.