In Castlevania and Metroid, you feel like there's a purpose to what you're doing. Terraria is more like doing things for their own sake. Unfortunately, that concept works much better for a creatively focused game like Minecraft. The creation aspect in Terraria is not really the emphasis of the game, which is okay, but the adventure is boring and lacking in any real goals.
Also, stolen Final Fantasy sprites for the lose. I mean, I know they were replaced, but I can't shake the feeling it's only because people noticed and complained; the idea that they were merely placeholders all along seems like an excuse made after-the-fact.
P.S. Thanks