Self-explanatory. Series who's primary focus is fighting would fit into this segment. Yu Yu Hakusho and Ranma 1/2 are classified as fighting series. But if you can, then please select a more specific keyword instead, such as "Gun-Action" or "Swordplay"; maybe some day we'll completely split up this category into some more terms of this sort.
Acquired Taste: These are titles which may take a while to get used to. As such, you should watch several episodes before making up your mind. FLCL, Di Gi Charat, & Serial Experiments Lain are examples of such titles.