Pikmin 1 was not an easy game for most, there was a high level of stress whenever it was played. Pikmin 2 made things a little simpler, the developers tried to get rid of as much of the stress as possible.
Pikmin creator Shigeru Miyamoto had this to say about the Pikmin series:
First of all by looking at Pikmin 1 we noticed that it wasn’t a very easy game for people to play, and from time to time they had to feel some stress.
Our main aim in Pikmin 2 was to get rid of any stress as much as possible, so that it would be very user-friendly. Well, I myself couldn’t agree with that direction perfectly, That kind of nature of Pikmin 1 was exactly what I wanted to reproduce and I was actually intentionally doing so, so that Pikmin 1 could be a strategic game.
When we started creating Pikmin 3 I gathered the main members who worked on Pikmin 2 and talked about how I thought it was important to get back to the basics of Pikmin 1. Or I should say that half of my job at that time wasn’t just to talk, but rather to persuade them to understand what I intended to do and to agree to my idea.
So it looks as if when Pikmin 3 releases this year it will be a little more difficult than Pikmin 2 was known for. This is an excellent idea as it makes the game more rewarding when you finally beat a level.