I'm fine with the DLC, even if it's day 1, they had a budget for the main game, they had a budget for the DLC, I understand that.
I'm fine with the season pass too, they've announced exactly what it gets, not some vague promises, and it gets it at a discount, that's cool.
Rosalina being a DLC character though I am not ok with. I originally thought her exclusion was just some weird Waluigi in Mario Kart 7 situation that makes no sense, but being announced as a DLC character before the game's even out just screams cut content to me.
She's one of 5 playable characters in 3D World, she's one of 5 playable (Mario) characters in Smash Bros 4, she's part of the main Mario crew these days, there's no way she wasn't planned for the base game.