Since this is a novel based on a video-game --which uses Tom Clancy's name but wasn't actually written by him-- one could read it with reasonably low expectations. But funnily enough, I kinda liked it. Michaels' writing style is nothing to write home about (heh), but he's good with character development and suspense. The plot is interesting --and feels grounded in reality--, and although Sam Fisher doesn't appear as much as one would want to (no spoilers, I swear), at least the novel's actual protagonists are well-defined and likable.
The last hundred pages or so felt a little rushed (especially since Michaels started using less quotes for dialog, for some reason) and the story's ending wasn't as satisfactory as I would've hoped, but all in all, Endgame is quite the page-turner, especially for fans of the games, like me. Plus, any novel with references to AC/DC, my favorite band, will gain extra points!