Many times I see questions which are wrongfully tagged, but I don't have the slightest clue about what tags they should be.
Generally by people who have absolutely no idea what the topic they tagging is about (common example is set-theory tags for things that are not even related to elementary set theory, but rather combinatorics and such).
Should we have a tag for wrongfully tagged questions, so the more experienced users could follow and properly retag the questions?
A "wrongfully tagged" tag would be a meta-tag, which is generally discouraged.
If you do notice certain users consistently misapplying tags, please bring it to the attention of the moderators.
Otherwise you can leave a comment to the question. Sometimes the "more experienced users" do not necessarily notice the bad tags. By leaving a comment you make it more likely that they will see that the tags should be changed and change it.
No, please don't create a meta tag for this as they are explicitly disallowed.
http://blog.stackoverflow.com/2010/08/the-death-of-meta-tags/
Instead, the proper thing to do is simply click the "flag" link to flag it for moderator attention and indicate you think it's mistagged.
(and Willie's advice of leaving a comment is also a good strategy)
Maybe a possibility how to bring attention of other users to questions which have incorrect tag would be mentioning it in tagging chatroom or main chatroom (or both).
Of course, it might still go unnoticed and even if some people see it, that does not necessarily mean that somebody will be able to suggest a better tag. But at least it could improve the chances.
(See also here for some details on the creation of this room.)
