With a sitename like Greatest Anime Source, you would normally think that it has a ton of anime scenes. You would actually be wrong in this instance, as it really refers to hentai manga, American comics and other forms of toon porn stills. However, there's plenty of action to be found.
One thing that might turn you off is the lack of search features on GreatestAnimeSource, while another will be the way things are split up. There are 10 categories of comic book and erotically drawn solo images. However, as some are so similar to each other, you run the risk of catching the same sets in different galleries, whereas some sections are lower on content due to the fact that the rest of the similar material is already in another category.
Those categories include 3D art, BDSM comics, EU/US manga, pure (meaning untranslated) manga, and more. There's also a section dedicated to Sailor Moon hentai, comics and cosplaying, as well as a hentai category that features content related to hardcore anime movies.
There are no movies at all, but some of those aforementioned hentai pics are actually screenshots of animated Japanese porn movies. Without any vids, it takes a decent amount of pics to really get some people going, but that's exactly what we get here. Those 10 sections house 10,619 picture galleries all said and done.
For the most part, you'll be pretty pleased with the quality of these images. Sizes can vary from shot to the next, but they're almost always high-res images and, when they're not, they're still usually pretty clear. Sometimes you'll come across a very light image, but these pics are usually part of an artist's portfolio, so the reason they're so faded is because he never bothered to ink them.
The update frequency is really erratic. There are times when several sections have dozens of new image sets added on nearly a daily basis. Then they can go months for some galleries and only add one or two to others. On average, you can normally expect one day of updates (scattered across at least three parts of the site) every three weeks.
While waiting, you can check the tons of extra pics and video feeds that come with your membership. There's a bit of something for everyone, including more cartoon porn and a bunch of live-action stuff. There's also a user forum.
Greatest Anime Source is indeed great for access to thousands of cartoon images. However, anime in the classic sense (meaning Japanese-style cartoons) is non-existent. Also, none of the content is exclusive.