That's because in the days when those movies were made, they didn't have convincing CGI and used puppets and stop motion animation. With the human skin on, they were played by "oddly enough" humans" Of COURSE there's going to be a difference.
Also, one could say that when they lost their "skin" that the unlucky terminator recieved "battle damage" in the process somehow. *shrug*
In the new TV series, a terminator loses it's skin and it does walk a lot more convincingly as it's motion captured CGI. The technology isn't truely perfect yet... but it's close.
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