Played one you've played them all. I remember getting the first star wars lego game (2005) on PC funny enough. It was okay... Obviously a kids game but still some fun to be had. Just a few months ago I tried out the Lego Batman/DC game (2013). I was shocked to find out it was almost the same game I had played 7 plus prior. Same UI, combat, puzzles, enemy types. I guess they're going with the "if it ain't broke, don't fix it" idea. To me the only reason they sell is the franchises they are connected with. Most of the standalone LEGO only games were flops.
My favorite Lego game as to be Lego Island (1997). The game has a lot of character without any other franchises involved.