I see most of the comments here are saying that they prefer Pikmin 2 to 1 by a long way, and a lot of this seems to be due to the time limit of the first game. But for me, the time limit was actually quite cool.
I personally like a game to feel like a well rounded package with its own unique feel, and I think the time limit aided that. I didn't have any problem finishing the game fast enough to get the best ending and I felt that knowing there was a time limit made me plan out what I was going to do each day before I did it, which was part of the fun for me. While the time limit did give the game a shorter life than the second one I don't mind this either, I'm quite happy to play a short game, particularly if it high quality throughout and if I bought it for very little off eBay.
I wasn't disappointed to see the time limit go though, not having it made Pikmin 2 feel quite different to the first one, so I was happy with the second game. But one thing I didn't like was the caves. I found them to be tedious compared to the vibrant, exciting surface. It didn't really improve the game for me, it just felt like filler. This didn't stop me from completing the game 100% though!
Despite liking the time limit and disliking the caves I still definitely preferred the second game though, solely for the much improved pikmin AI. In the first game so many of my non blue pikmin drowned themselves and getting them safely across a bridge or up stairs was just frustrating. I know Miyamoto doesn't mean he is making the pikmin back into the imbeciles they were in the first game when he says he is going back to that, so I am quite intrigued as to what he means.
Going on other peoples comments, maybe the time limit should be left out though. It seems a lot of people really don't want it, and I would be happy either way to be honest.
Hey Reggie, where's the cats?