I just updated the tag rainbow-six-series with a summary and main wiki. One element I feel is important in a series tag is listing all the games that would be included in that series. If available, I provide tag links.
This lead me to look up the available tags, and of the three available, all three show minor issue.
rainbow-six-3: In this case, the tag itself is valid. However, there is only one question being asked;
The original version was released on computer as Rainbow Six 3: Athena Sword, and while it was later released as "Rainbow Six 3" on console, the console version has some different content, and as I have observed previously, this in itself suggests the use of a separate title tag.
rainbow-6-vegas-2: Simply an inconsistency issue, but I am sure the extra two characters will not break the character limit. The tag should be rainbow-six-vegas-2, assuming deliberate consistency. This is the way it is spelt on the box, and in fact, every rainbow six game apart from the cancelled "Rainbow 6: Patriots".
rainbow-six-siege-beta: A tag created for a question regarding the beta of Rainbow Six Siege. That said, beta is a "pre-release" version, released to allow the game to be tested by a wider community before release. Furthermore, since this version will be replaced with the release version upon launch, there will come a time (within several months) where this tag will not relate to anything available to the general public. For this reason, I propose replacing it with rainbow-six-siege. The tag wiki could make note of its current beta form, and be updated later.
- rainbow-six-3 should remain, but a summary should be included to inform users that Rainbow Six 3 is the console version of Athena Sword.
- rainbow-six-3-athena-sword should be created, and used to replace the tag on the rainbow-six-3 question.
- rainbow-6-vegas-2 should be replaced with rainbow-six-vegas-2.
- rainbow-six-siege-beta should be replaced with rainbow-six-siege.