This is not a zombie movie, but a brain-in-a-jar movie. That's why they are "smarter than before", if by that you mean they are smarter than the usual zombie. Zombies don't especially go for brains except in parodies; real zombies, if I may call them that, eat whatever they can grab - brains, hearts, lungs, spleens, intestines (oh they LOVE intestines!), arms and legs, you name it. It's truly a hand-to-mouth existence.
Judging from the parking-garage scene, the cyborgs (or whatever they are) eject a used-up brain and replace it with a fresh one, which is why they need so many of them to keep the invasion going. Apparently the human brains are only used as a kind of battery or CPU, with the higher-level functions of the organism kept somewhere else. Jarrod, for whatever reason, is able to overcome this alien supervision, and replace it with his own brain's fully-working executive function.
Apart from this, and I realize it is something of a nitpick, it would be fun to see the sequel that you imagine: an army of Jarrods rising up against the invaders, and beating them; then at the end of the movie (as I imagine it), starting to recreate "human" society from what humans have become.
Brain-in-a-jar movies are rather out of fashion these days, but were very popular in the 50s and 60s, from The Brain That Wouldn't Die to "Spock's Brain".
http://tvtropes.org/pmwiki/pmwiki.php/Main/BrainInAJar
Maybe if a movie like this got popular, it would bring brain-in-a-jar movies back, and I would love that, since I'm pretty much bored to death with zombies.
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"Oh, well" said Zanoni, "to pour pure water in the muddy well does but disturb the mud !"
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