Had the same thing happen to me as with Picross DS.
When I first got the game, I didn't like it that much.
Didn't understand the love this game got, so I put it aside thinking it was way to easy for me to be enjoyable.
A couple of months later I gave it another go since I was bored and wanted to play a puzzle game.
Got past the easy puzzles and into the medium ones and fell in love.
Perhaps that's a bit of an understatement as it became somewhat of a passion.
I even bought 2 Japanese copies and another Pal one so I could download and save all the special puzzles without having to delete any.
Bought Illust Logic on the DS soon after on import.
When I got Picross 3D I tried it out and didn't really like the graphical touches, nor did I think the whole 3D thing worked nearly as well as the 2D ones.
So I put it aside.
A couple of months later I decided to give it another go as I remembered what had happened to Picross DS and was hoping this would be the case with Picross 3D as well.
To my surprise I fell for the same trap.
The easy puzzles at the beginning aren't fun at all and the tutorial is a drag, but once you get past the first couple of levels and start getting the hang of how it works in 3D it's soooooooooooooooooooo addictive.
Not sure if it's better that the 2D one, but who cares. It's different and incredible in it's own way.
I can't wait to get Picross 3DS even though I'm sure I can spend another year on Picross 3D without any trouble.
Just downloaded a bunch of puzzles and filled up the my picross section.
I love how they seem to be mostly very large puzzles as I was afraid it would be a bunch of 5x5x5 puzzles for the most part.