Things would work better with human interaction on the requests by Google. But bluntly, if you want your video host to do due diligence, hire one that does. Google do a bad job of this because they're a free hosting provider, and as a video uploader you subsequently get what you pay for.
If someone wants to complain about infringement, they should be required to send a certified letter to YouTube detailing the exact infringement along with providing proof they are in control of the offending work.
Legally this make perfect sense to Google, as there are two options:
1. Take down everything requested. Creators get mad but they are a dime a dozen.
2. Don't take down everything because some of it isn't technically a violation. Get sued constantly by the media cartels. Get brought before Congress for "stealing from artists". etc...
One party in the dispute is rich and politically powerful, the other is not. There's really only one choice a large company like Google is going to make.
...and ironically, a lot of us are quite worried about the other party also becoming "rich and politically powerful" too (although they do seem to be getting there...)
IANAL, but as I understand it, Content ID is part of how they justify being a safe harbor under DMCA.