refinder said:
Some series names aren't obvious and some names are also the names of characters in them. Some people just like using the search function instead of clicking on tag links to find things in a hurry.
Adding series: before the series name is so everything is standardized.
Series itself isn't a stand alone tag that is applied to anything, so there's no problem in having everything that's from a series show up when you search for series.
It just seems like the "series:*name*" thing is bugged because whenever I enter just "series" alone, it brings up EVERYTHING, instead of nothing like more incomplete searches. As for names, it really wouldn't be that hard to do things like "resident evil" for the RE series, "the legend of Zelda" and so on. Granted, things like Naruto could be confusing, but I usually go with the danbooru style of using the name for the series tag, while using the character's full name for character tags.