While wheels are faster and more efficient and tracks are best on a soft ground (it's hard to beat one big support area), spider legs can navigate extremely rough terrains and are more reliable because the vehicle can stand or even walk after losing a leg or two. You can't escape the Rule of Cool, it seems. Of course many creators then go ahead and give it feet that taper to a point in order to make it look more like a real arthropod, which ruins any overall improvement in the ground-pressure department. These help it cheat that pesky Square-Cube Law that gives giant humanoids considerable engineering problems. Giving a machine multiple legs helps it keep its footing.
Increased points of contact with the ground also increase stability - the human shape is a lot more precariously balanced than it seems, and bipedal robots in real life tend to have serious balance issues.Your classic Spider Tank spreads its legs out more, making the vehicle more stable overall and allows it to traverse terrain that would give wheeled vehicles considerable trouble.The hull can be lower to the ground and thus less of a target.The form has a few advantages over the human shape: In series that use giant humanoid robots as well as spider tanks, you can bet that the humanoid robots will often be more agile than their multi-legged counterparts, despite the fact that the opposite logically would be true. Even if the setting doesn't use giant robots, and sometimes even if it does, smaller Spider Tanks may be found as robotic drones. These are often used by sci-fi series that want to use giant robots, but feel that humanoid shapes won't fit the setting. A subset of Real Robot, with a decidedly non-humanoid appearance.
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