Sonic Boom didn't do well on any metric; its sales failed to match those of fellow Nintendo exclusive Sonic Lost World, and it was panned by many critics and Sonic fans alike. Like any project it has its defenders, but many are agreed that it was a major disappointment, with Sonic Boom: Rise of Lyric on Wii U being the biggest culprit.
It was a game with many problems, from the gameplay down to visuals that weren't in the same league as those of a teaser trailer that had built hype in the first place. A lot of blame naturally falls on Big Red Button, which was producing its first game, though the studio may have been victim to mis-management from SEGA; perhaps its Sonic's own house that is most to blame.
SEGA has messed up its share of projects when working with third-parties in the past, so it's certainly feasible. In any case that seems to be the contention in the video below from Unseen64 Liam, which cites former BRB employees stating that the project was originally in the works for other systems, and that the transition to Wii U was an issue due to the use of CryEngine 3.
It's an interesting watch, so check it out and let us know what you think.