"New" is really no longer accurate.
Granted, I played it out of its release-date sequence -- but New Super Mario Bros. 2 just feels indefensibly not-new. The "New" SMB formula has run its course. And this installment's unique feature - excessive coin-collecting - just isn't that interesting. The moment-to-moment gameplay feels stale and sterile.
Also, I don't seem to be able to tolerate the 3DS's physical buttons as much as I used to. At least not in a realtime platforming context. Not sure why it's different now, but, holding 'Y' and pressing 'B' intermittently feels strangely uncomfortable.
Progress: Finished the first world mid-boss, collected 893 coins.