I liked the Lego games a lot, so I'd be in the market for a game like this. They were fun, charming, and humorous retellings of the properties they were based on (although I think later series lost some of their charm, as they did stuff like rip voice clips from the games/movies instead of having the Lego characters pantomime everything, etc.)

Stuff like the building-based Firefight-esque stuff looked cool too. Plus, even with a T-rated main series it doesn't hurt to have other friendlier outlets to get fans into Halo (this would have come out before H5 anyhow.)