Now uhh, not to start a fight or anything, but Sonic Unleashed had it's fair share of problems, mostly in the night stages. Some of the design elements were horrible in there and made me want to stop playing. I mean, some jumps was entirely trial and error, often due to the horrid camera angles they chose. When you can't even properly tell where the hell it is you're jumping, you know something's wrong. That said, the day levels are certainly a breath of fresh air.
As for Sega itself, it's made some decent stuff, if we look elsewhere than the Sonic games. They're capable of good things still, which is possibly why some people are so frustrated by some of the Sonic games lately, although they tend to overdo it sometimes (too fast... hah).