It's excellent. It contains the following things that really make it stellar:

A dual-map featuring the light world and dark world. The first of many 'dual world' zelda games [such as OoT's child and adult worlds]

Perhaps the game with the most widely used magic. Wands, spells, canes, a cape...you name it!

It's the first game with a great backstory, and lots of supporting tidbits of information throughout the game to add to it. Overall, an excellent storyline.

More dungeons than any other Zelda game ever, but there's enough stuff to do in between dungeons to keep you interested.

Pretty sure it has more weapons/items than any other 2D Zelda.

Lots of cool upgrades

Epic ending [in my humble opinion]

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Bomber's Notebook | Zelda Informer, Home of The Bombers | Theorizing Resources | Aralith's OoT Retelling
Voted as Best Zelda Theorist in the Summer '08 Awards. Thank you to all who voted, and to all who inspired me along the way!