Super Mario Galaxy - 5/5
If you haven't yet bought a Wii, here's your justification - whether young, old hardcore or casual gamer.
Assassin's Creed - 4/5
Even so, the dimension of townsfolk working with or against you, the ability to scale any building with ledges two inches deep or more and the option of flee or fight gives you the freedom to approach tasks as you choose. Add a stunningly detailed Holy Land to explore, and you have an enticingly immersive game worthy of your time.
Sim City Societies - 3/5
Diehards may complain this is more The Sims than Sim City, but it's an imaginative reinvention.