I agree with KaZiZ and several others here. Zelda has gotten rather silly. Only I don't mind the continuity issues brought on by forcing an overarching timeline on games that were never originally meant to have it. It's kinda like the forced continuity Iga brought on the CV series, except that Zelda's continuity is an absolute joke compared to CV's.
Anyway. The silliness issues I have with Zelda begin with Ocarina of Time. I love the first four Zeldas, but from OoT forward, the games just got too kiddy for me. I do think the silliness really started with aLttP, but that game seemed to strike a good balance between goofy interludes and a serious overall tone. OoT had its serious moments, and certain parts - like the Adult Link version of the Hyrule castle square - are borderline creepy, but the game overall seems to be targeted toward a much younger generation than the first four games.
I wonder if this is just my impression, since I grew up with the series and my age compared to the target audience changed as I grew older. I was just a kid when the earlier games came out, but when OoT was launched, I was a teenager who was just beginning to fixate on how good games used to be. But there does seem to be a divide between those gamers who grew up with Zelda's 1-4, and those who were first introduced to the series with OoT. I know there are those gamers who played the first game when it came out and have stuck with the series ever since, but they seem to be much fewer than those who gave up on the series after the early titles. You can say the early games were limited in their silliness by the limitations of the hardware, but early Castlevania games certainly didn't come off as games for kids.
In other news, I picked up A Link Between Worlds tonight and am enjoying it so far, though it seems a little too derivative of aLttP.