Only played the first Bionicle flash game, an Alpha Team flash (I think), and the Star Wars prequel trilogy on the Gamecube. Granted, when it comes to the latter, I really don't like Star Wars as a series anymore; haven't in years. But I always thought that the force mechanic as a concept perfectly integrated with the deconstruction/reconstruction aspect, in a way that the premise for most later licensed Lego games never quite struck me as doing. While I know not every character could use it, I think the "mind over matter" part, that the character had a vision of exactly how they wanted it to look and didn't even have to touch the bricks to implement it, was the key factor.
>My Favorite always has and always will be MNOG.
It wasn't much of a "game" (well, any more than most point and click adventures, anyhow), but it did a great job not only helping to build up a world behind the actual sets of the time, but also letting the player feel involved in it. Heard the second flash was a complete mess, which strikes me as a shame.