I play every Lego game that comes out. On the PS3, they're easy Platinums, which is why this stack is sitting near my TV:

Undercover is the best Lego game ever made. Period. It takes the open world idea from Batman 2 and LOTR and turns it into a GTA-style city with TONS to do and lots of Easter Eggs.
Super Builds are new to the game. In addition to collecting bits like on the other Lego games, you also collect bricks that you can get by destroying objects and finding hidden super bricks. Once you have enough bricks you can do a Super Build. These range from vehicle stations where you can purchase vehicles to drive around in, ramps to do stunts and reach new areas, to larger objects like a ferry that's needed to reach an island prison to continue the story missions.
The only problem are the load times, but you put up with them because the game is so fun and will sap so much of your time. I know people who have played it until the battery in their gamepad died.