I’d wait until the price lowers a bit before buying it. I think they’re fair enough for Bargain Bin games. I haven’t actually played either of the Sonic Boom games. But either way, from what I’m hearing. It’s best to wait til’ they’re pretty cheap.
Or better yet there IS the Demo of the Wii U version that comes out on the 4th of this Month (There’s also a 3DS one out there already). So maybe when December 4th comes try out the demo to see how you like it, and the 3DS one too if you’re interested in that as well. (I might get the Wii U Demo myself sometime)
I don’t think it’s the “BIG DISASTER” “WORSE THEN SONIC 06” that some have been claiming. But it’s probably among the pile of pretty mediocre Sonic games at best. But there are some that have found some degree of enjoyment. But even those who fairly liked it weren’t too interested in playing more after the first run through the game. Which is why it’s best to pick it up cheap if you really want it. It’s a game that you might enjoy at least somewhat through the first runthrough but their might not too much there for you to do that perks up your interest in playing through a 2nd time. Don’t waste $50-$60 dollars on a game you’ll likely finish in a weekend and have little-to-no interest in playing more afterward.