I'm considering it because I really liked playing it on the Wii and DS, but I don't have a Wii U. What's it like in single player mode? How do the tracks differ from other versions? What are some new features?
You should get it, I was in the same situation. (Can't get a Wii U and loved the older games). It's great, and the new features are fun! (Flying, underwater, customizable karts, etc.) Its worth it.
With the release of MK8, I'm starting to think I should grab 7. I never gave it the time of day, but now that everybody's talking about it I'm feelin' the urge to pick it up.
I wonder if MK8's release hiked up the MK7 sales for the same reason...