Background info on what meta tags are is on the StackExchange Blog.
The Story so far:
We've had a meta tag problem for a while. Perhaps since the origin of the site.
Why these tags are bad:
One of the defining characteristics of a meta tag is that it can't stand on it's own. If these tags exist, then people can, and do use them as the only tag on a question.
Build consensus - I've spoken to the other mods and a few of the more active members of the site and I think there is consensus on removing these tags. It'd be better to have that consensus be explicitly stated here on meta.
Remove the tags on older questions - Over the last few months, due to normal front page rotation, the count of rules has decreased over 10%. However that still leaves 438 as of this writing, and another 161 on strategy.
If you agree with me that these tags should go, feel free to join in on my effort. Ideally we don't want to flood the front page with old questions. But something like 5 at a time is cool. Then pause for a few hours, see if those old questions get pushed down again and do 5 more.
Alternatively, you could note a couple new questions that need editing, but first, clean up some older questions, then edit the new ones to put them back on top.
I believe slow and steady will win this race.
Identify other meta tags - I'm sure there are more. For new nominations, please put them in an answer (1 per) to allow debate. If we get consensus, we'll edit them in here on the question and open season on them.
I'm deleting the answers for the below to focus attention on the open discussions.