User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-2014385-20130922040751/@comment-21371438-20130922105858

WELL... indeed Water is the most underrated element, but it's secretely one of the most powerful:

-first, against generation volcano monsters (gravios, Agnaktor) that usually are in the latest ranks of the quests lists (i even beated my first agnaktor after beating my first ceadeus)

-second, if it wasn't for the slime, it would be the most useful element against heavily-armored creatures (indeed, basarios, gravios, agnaktor etc.)

-third, generation cave wyverns subspecies share their water weakness

-some exception, Zinogre and Brachydios, both weak to water and ice

-Alatreon, surprisingly mostly hurted by water!

so... yeah, secretely water is one of the most useful elements, even if lately everything is inferior to slimeblight...

i'd say the most useless element is... surprisingly Dragon element! useful only of less monsters (flagships -rathalos and ivory lagiacrus- and all elder dragons), but indeed achieving dragon elements means we now can kill the most powerful creatures

we definitively need an element power chart in generations to state what's the most powerful element -aside from slime-