So I ask you. Who's dumber? Chloe from Stargate Universe, who, after seeing a hole cut in the ceiling of a hallway, dumbly walks right under it and is promptly captured by aliens, or Chloe from Smallville, who is trapped and nearly killed by a backdoorless security system of her own design?
I say Stargate Universe Chloe. SGU Chloe hasn't shown much intelligence or use so far, though possibly her study of Dr. Jackson's work might prove useful eventually. It's not like she has anything else to do, she's not a soldier, and she doesn't have the technical training needed to assist the scientists.
Smallville Chloe overall isn't stupid, she is pretty smart, but in the later seasons she really did get flanderized into an ugly Mary Sue computer hacking genius that can solve any tech problem that Clark or Ollie has. However, whenever the plot demands it, she's handed the idiot ball, and she promptly takes it for a 99-yard sprint (or whatever the right terminology is because I hate football). But she only takes turns with the idiot ball because everyone on Smallville gets to hike it 4-5 times a season at least. I haven't seen Smallville since the first half of last season, and I just skimmed over your plot summary. Going from the habit of the writers to break out an idiot plot like every other episode though, I can't say that it's Chloe that's stupid for bad programming, it's the writers that are stupid for being unable to come up with a coherent plot.
I finally gave up on watching the show last season after the plots got more and more absurd. I got sick of the under-30 casting crap of the CW, sick of Lex not being in the show any more (and he had some prime character derailing idiot ball moments too), sick of this Tess loser I don't care about, sick of Ollie showing up with his bad pretty boy dye job every episode, sick of Brainiac's more and more farfetched plots, sick of Lana's constant whining, sick of that loser emo wannabe Doomsday they put in the show, sick of Chloe miraculously solving every problem on the show, and just plain sick of a show that's been on the air for too many seasons. It doesn't help that I'm not a Superman fan, hell the only DC universe superhero I like is Batman, and I'm more of a Marvel fan myself.
The only thing that's actually good about the show is when Clark and Lois have to work together on something, but I don't think it's really worth tuning into the show to watch them. The show has indeed painted itself into a corner, the producers are trapped by the initial premises of the show, some of which the show moved part like 4 or 5 seasons ago, and I daresay none of them are creative enough to think outside the box or whatever to produce believable plots.