"Why didn't they just use that earlier?"
For the same reason you don't tell the punchline halfway through the joke.
Yes, but jokes don't normally result in decapitation.
You're doing jokes wrong then.
"Why didn't they just use that earlier?"
For the same reason you don't tell the punchline halfway through the joke.
Not a narrative reason. An in-universe reason.
Ninjadedit: People generally don't like Cloverfield? I was under the impression that it was received pretty well.
In-universe be hanged. You've got giant mechs being assembled to fight giant monsters. It is basically the single most ineffective use of technology for fighting giant monsters. You fire railguns at them. You drop tungsten lampposts on them. You use the world's massive arsenal of ICBMs.
The whole premise of mecha is based on the fact that we are doing highly impractical things by using advanced technology in a silly way. That's really what it boils down to. If it takes itself completely stone-faced serious, it only makes that worse.
Also, Cloverfield was awful. It had characters so incredibly irritating that you were cheering for everyone to die and die quickly just so you wouldn't have to listen to their annoying whining in their annoying voices. Their 'fake amateur camerawork' muddies most scenes into incomprehensibility, and since the actors lines consisted of sheets of paper with the words 'SCREAM' printed over and over, it was basically the equivalent of sitting in a rollercoaster tunnel for 2 hours.
As for marble hornets, that was decent until it got to the bit with the stupid knife wielding guy in a hockey mask. At which point it completely ruined the entire slenderman mythos for me through sheer power of cheese. Aside from that, it was a decent internet ghost story.