There are a couple things that you’d need to make a great Lego game. First, you need a lot of characters, and they have to have a diverse skill set. We need to have a reason to switch between all those characters. There needs to be action, you have to fight someone, and that someone will need a horde of anonymous troops for you to fight. And lastly, we’ll need a large world with lots of different locations to play in. A good story pre-existing storyline can help, but they can make up their own just as easily as long as the characters and world are good.
There are several franchises that I’d like to see turned into Lego games. Sure, some of these don’t even have a chance at making it, but it sure would be nice.