These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Alternate Character Interpretation: Is the Thing the vanguard of an Alien Invasion, as the soldiers speculate? Or is it a frightened being stranded alone on an alien world, viciously attacked immediately upon regaining consciousness, and justifiably working to defend itself?
One might believe that at first, but the alien had many opportunities to either leave or make its peaceful intentions clear. It didn't do either.
On the flip side of this, the team lead by Captain Hendry. Are they really valiant defenders of Earth's humanity? Or are they intolerant small-minded bigots that attack whoever and whatever they don't understand?
More specifically, by destroying the pods, were they eliminating an invading army from outer space? Or murdering innocent alien infants? The fact that it was the professor and not the Thing who was growing them doesn't help to clear up the issue.
Hell Is That Noise - The ominous click-click-click of the Geiger counter as the Thing approaches.
Memetic Mutation - "Watch the skies, everywhere! Keep looking. Keep watching the skies!"
There's also the scene where The Thing gets doused with gasoline and set ablaze, and continues to rampage around a cramped, darkened room, setting everything else on fire in the process.
Part of the problem is time. A lot of the Horror techniques we see every day were invented in this movie. In the early 50s, they were absolutely shocking. The fact that it still can give chills so many years later is a testament to how well it was done.
Narm Charm - "An intellectual carrot! The mind boggles..."
Ass Pull: The revelation in Eternal Vows that Things can not only change their own form at will, but kill someone and change the victim's body into a copy of their own, is something that comes out of absolutely nowhere.
Bizarro Episode: Eternal Vows differs from both the film and the previous two comics in so many ways (particularly in the first issue, which doesn't feature MacReady or anything else readily identifiable from its predecessors) that many fans have speculated it wasn't actually a Thing (from Another World) story originally, and was hurriedly turned into one so that Dark Horse could shove it out the door before the license came up for renewal.
Agapito from Climate of Fear, due to his badassery (including slicing off his own arm and being hardly slowed down) and being by far the most intelligent original character from any of the four comics.
To a lesser extent, Detective Rowan from Eternal Vows, for being a rare instance of a helpful and comparatively intelligent authority figure.
It's the Same, so It Sucks: The biggest criticism of the first comic is that it doesn't really add much over the film, other than MacReady taking on the Thing with a lot more in the way of military hardware.
The Scrappy: Dr. Viale from Climate of Fear due to being a token female character, constantly displaying extreme stupidity, and an attraction to MacReady which comes out of nowhere in the third issue, and then is never followed up on in the fourth.
Sequelitis: None of the comics are considered nearly as good as the film. Within the series though, Eternal Vows is generally considered to be a major drop-off in quality from the first two stories, and Questionable Research just plain crap.
Surprisingly Improved Sequel: Despite having noticeably worse art quality than the first comic (and Eternal Vows, for that matter), many consider Climate of Fear to be the best of the four stories, for being the truest to the film and also doing some original things with the Thing.
They Wasted a Perfectly Good Plot: Eternal Vows has some interesting ideas — setting the story mostly from the Things' point of view and having differing factions of "feral" Things and ones with more controlled behavior — but they mostly fall apart in execution due to the writer clearly not understanding the film that well.