10) Call of Duty: Black Ops III (2015)
Treyarch's last Black Ops entry ranks below its predecessors (keep reading), as this trilogy-capper delivers another solid, but somewhat uninspiring extension of the far-future formula.
The campaign plays some neat tricks with its sci-fi powers and weird mind-jacking abilities, but doesn't really feel fresh overall. Multiplayer fares better here with some terrific maps and a move to a class-based system, but ultimately it feels a bit like a Titanfall knockoff. It's a great, long-lasting package, but also sees the Call of Duty essence somewhat muddled as a result.
9) Call of Duty: Infinite Warfare (2016)
It sort of feels like we're just ticking off the most recent entries now, aren't we? Infinite Warfare sheds any illusions about the series dipping its toes into sci-fi and dives right into the pool, sending you off to space and onto other planets.
Weird, right? And yet Infinite Warfare soars in spots: the universe feels really built-out, the presentation impresses top to bottom, and the campaign makes the most of the new setting, allowing single-player to feel fresher than it has in a while.
Many series fans loudly voiced their displeasure with the setting shift, however, and so the shift back to World War II should be warmly received. But there's actually a lot to like in this one.
8) Call of Duty: World at War (2008)
World at War was the series' last main attempt at exploring a World War II setting, and it has since been framed as prequel of sorts to Treyarch's later Black Ops entries.
World at War had a solid and expectedly glossy campaign, but suffered from the comparison to the previous year's classic Modern Warfare and its own memorable moments. Furthermore, the game tried a bit too hard to come across and gritty and horrific, with the end result feeling crass and uneven.
Still, World at War gave us Nazi Zombies, the weird-yet-delightful co-op side mode that has become a mainstay of the series, and the multiplayer was rather strong, too.