In addition to the comments already posted, if you are playing with Ghost Anakin or Ghost Yoda, there are parts where you need to switch to another non-ghost character to grapple across ledges or open doors. Make sure to take care of all enemies before switching I made the mistake of quickly trying to switch to that character but got spammed with laser fire. It's not an issue with R2D2,C3PO, or other robot characters but is for Stormtroopers and the like. If there are infinite waves of enemies, know where that character you need is in your lineup to save as much time between the waves.