It really depends on what Zelda game you are playing. If I'm playing Loz then you definitely need one. Taol very important. Alttp I use it a lot. Oot I rarely used it, mostly as a child. MM I think I did only against Deku scrubs. Wind waker, I use the shield more then My sword. TP I didnt really need it, SS it was only useful when fighting cursed Bokoblins