I think Lost World is a solid game. Here's a review for Sonic Generations that has always stuck with me, it's relevant to the hate Lost World's gotten.
"A reminder of both what you adore and abhor in a series that's had its simple joys diluted by flash-in-the-plan iterations and ideas." - Edge Magazine
Lost World, yet again, changed the series' game play style. Which caused a lot of backlash. I think Sega needs to stick with the game play style from the 3D sections of Colors and Generations. That's another thing the series has going against it, it's constantly switching between 2D and 3D even in the same levels.
"On my business card I am a corporate president. In my mind I am a game developer. But in my heart I am a gamer." - Satoru Iwata
