When it comes to the Nintendo 3DS games available at launch, there are several that are ports of previous titles with3D added to the gameplay. The new Nintendo 3DS title Rayman3D is among these precious gems. It’s a port of the good old Rayman 2 from Dreamcast & Nintendo 64. Its a fun filled 3D platformer requiring at least moderate skills at gaming. The levels are worlds which you explore to find items and secrets while hunting down the goal.
I recall playing Rayman 2 on my Dreamcast back in the day and being impressed with its gameplay fun factor. Its not the hardest game around, and is fairly easy to jump into. There’s enough secrets in the large levels to keep the replay value of the game at a moderate level. I consider it a fun game with an interesting level design. If you are a fan of the Rayman games from the past, I’d say go for it and get this port. It doesn’t have too much in the way of new content (practically nothing) but it has improved lighting, modeling, texturing etc. when compared with the original and its various ports. 
If it doesn’t bother you that this is a nearly identical port of an old (but fun) game, and its available on a ton of other systems, AND you have a Nintendo 3DS to play it on, I can say without a doubt that its worth having this slick looking portable version of a classic..
Keep an eye out for my upcoming review of Rabbids 3D, a spinoff from the Rayman franchise that looks like a real fun winner of a platformer!