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Honestly, the question of the quality of Sonic games is not relevant here, as this is really a Sega Allstars/Sega Superstars racing game that puts Sonic in the title and on the cover to sell to kids and nostalgic fanboys.
It's similar to how the Sega Genesis/Mega Drive collection on PS360 is called "Sonic's Genesis Collection" in America, when it contains over 40 games from many different Sega franchises and only about 5 Sonic games.
This racing game will be very good, and if Sonic somehow left a sour taste in your mouth, just focus on the contend from Sega's other (often more consistently good) franchises like Jet Set Radio, House of the Dead or Afterburner.