I bought the disc version of Super Mario 3D World tonight and just finished the first world. As someone that didn't play much of 3D Land, I'm really enjoying it so far. Aside from the first of those no-jumping Toad stages, I've played as Peach exclusively so far and, while the first world isn't really challenging, it's definitely got enough to at least keep me on my toes. The only two times I've died so far were due to my own foolishness in falling off of the world. The cat suit is a lot of fun to use, but the fire flower has its own benefits, as well, like being able to throw them through pipes to take out dudes waiting on the other side.
I need more time to really form coherent thoughts on the game, other than to say holy shit guys, I am really enjoying it and you really should play it.