Some of these responses make me wonder if I played the same games as you guys.
Hard? Not really. I can't really remember any parts that were difficult or got me stuck. I remember getting lost in that desert part, but that was about it. Some of the dungeons have their annoyances, but the puzzles are pretty logical, IMO. Combat is fairly standard... and super easy if you have full health (with big sword).
I'm not sure what people mean that it takes after NES zelda... because I played ALTTP (for the first time) right before 3DDGH, and they both gave off similar gameplay vibes. The little bit of NES Zelda I played didn't really reflect 3DDGH.
The game can be unstable at times though, so save often. It does have missable quests too, difficult mini games, and tough trophies. But, if you're a fan of 2d zelda gameplay, this game is a no brainer, especially at $10.