And It's really not a Lucasarts game. Due to Lego's acquired licenses, they are free to create almost whatever product they want based off Star Wars with their own company or a hired third party. All they need is Lucasarts go ahead. Which was given.
I love the game personally (better than the Episode III game lol). Who cares about realism anyway. It's not like Lego's fighting is realistic either. It's so much more fun to be flying through a Coruscant battle watching bricks fly off of ships when they are destoryed.