But they still had a hand in making it and they also slapped their name on it, all big and proud.
You don't know that. SEGA might've wanted it to be seen in the same standard as there other major releases.
Here's the issue with what you just said.
Mario Golf is an obvious Spinoff title, meant as a party game.
Link's Crossbow Training was a game packed with the Wii Blaster add-on, used as a basic intro into the peripheral.
Kirby's Epic Yarn was a pretty interesting game, giving the Kirby franchise a unique, well-executed gimmick that only lasted a single game. It shouldn't even be grouped with these two, with your current argument.
Sonic Boom and Lost World were meant to be played by Sonic Fans. As such, they'll be critiqued as such.
Look, I'm usually not a negative person, but the Sonic Franchise is a dying ship with a Fanbase that doesn't want to admit it. Most of you try to act "optimistic", hoping the next game in the Franchise will be the Saving Grace, but let's face it; it won't happen. SEGA just isn't putting the same effort into their projects anymore. They know they're in a losing battle, and it's showing in their work.