The "war of the worlds" is largely decided by technology. The Martians simply have better tech than 19th-century humans do. (It's like Batman fighting a jaywalker – one of these people clearly has better toys than the other one.) But just because we all wish we could go to school in a tripod doesn't mean we should diss human technology. For instance, though it's very common to us, the bicycle did change the way people live. (Check "Setting" for more on that. Or reread the section in Mark Twain's Connecticut Yankee in King Arthur's Court in which the knights come charging in on bicycles.) We could say the same thing about trains and telegraph wires and all other sorts of technology. Whether we're talking about Martian Heat-Rays killing people or human ironclad ships destroying Martians, technology changes the way people live (and die).
In The War of the Worlds, technology is what separates intelligent beings from animals. So the Martians and the humans are more related to each other than the humans are related to the other Earth animals.
Although the Martians are finally destroyed by bacteria, which seems to make the ending a little spiritual for the narrator, the end is really a failure of technology and invention, as the Martians failed to invent some form of protection to replace their immune systems.