Don't tell me there isn't at least a bit of merit in what the franchise can produce when combined with Lego:
Lego has much more appeal then a normal videogame adaptation of the original trilogy, which likely would only be bought by the die-hard fans.
Plus, even though I am loath to vocalise this myself, I don't think it'll ever be likely to get the principal of the original trilogy back together to do vocal recordings. I imagine some could be brought back, but I bet that there would be the need for vocal sound-alikes, as I don't envisage there being as much of a reunion compared to Ghostbusters: The Video Game, where we lucked out that the only two characters not to return weren't important ones.
That, and the Lego games help to get new fans interested in the franchise.
There weren't any “Lego” shows for Star Wars or Batman, either… I don't see the relevance of your point. Despite that, they aren't a poor excuse for videogames, I found the Batman and Indiana Jones games extremely entertaining… in actual fact, the only ones I found poorer in quality were the Star Wars ones, and probably due to their being produced earlier, and Traveller's Tales not having hit their stride back when they were being made.
I say stop now please..
Goodluck trying to get them to stop.