Hehe. In the original scripts, if I remember correctly, the movies were meant to be set in Chicago.
Oh, and Ush, I really don't recall sentinels ever looking terribly spider-like. Some spidery qualities, but overall looking a hundred times more like squid than spiders. I even pulled out my huge Matrix artbook I have that's got all the concept art, storyboards, and a bunch of movie stills, and most of the sentinels we see really do look more like squid than anything else.
Squids, generally speaking, don't crawl along surfaces or use their tentacles remotely like the way a sentinel does.
If you don't think the allegory holds then fine, but I think that is a spectacular failure of observation about the way they work, the type of eyes they have, the way they look, (most importantly) the way they attack people, and even the way they drop when killed. And that imagery is very deliberate, because spiders have a long association with fear in humans. Whereas as BB pointed out earlier, squids are something you laugh at.
Besides which if you were paying attention you'd know that the earlier version sentinels looked different. These are the shells that Sennacherib gave them an any form of squid would be entirely useless.
So get used to it.
In case anyone is wondering...
Yes. This situation is brutal and exceptionally dangerous (though it is much shorther than other battles).
We're no longer playing around. People can die here and that is now a very definite possibility. The Agent at the end of the second part had good reason to think you doomed.
It's also the battle where it pays to be working for Marduk.