Sonic Unleashed is just one of several recent games where the Wii actually got a higher Metacritic score than the HD consoles. Especially Shaun White Snowboarding where the difference was over 13 points. Several other games that were on all three platforms had scores which made the Wii very competitive even without the HD advantage. Not that Metacritic is a perfect source but by averaging at least four reviews and sometimes many more, it does tend to filter out the single reviewer whose score is radically different.
What all these games have in common is that the developer made the Wii version separately and designed for that platform, instead of just porting over. (Not sure on Lego Batman)
The take home message hopefully to other third party developers is that it is possible to design quality games for the Wii that are critically equivalent or even superior to the HD versions
