I think PiT is a pretty good game, but I'm still playing it. I'm just getting to Star Temple (or something like that). That battle with the guy with the whistle and the bomb carriers took waaaaaaaaaaaay too long.
In general, PiT hasn't drawn me in as much as SSS did, which I played from start to finish in a comparatively short time. But it's a great game nonetheless. I like that they used the rumble pack and there are some fun puzzles. The story's a bit more forced and the back and forth through time gets tiresome (and was done before and better in Zelda). I think the fighting mechanics are much more complex with the addition of the babies and extra buttons, and in many cases that works to the game's disadvantage. There are like 8 items I've never even tried using because they're simply too frustrating. In SSS, I felt like I had more or less all of the techniques mastered by roughly halfway through the game, which made battles more enjoyable and less intimidating.