I tried playing Spirit of Vengeance as a Sith Sorcerer, but have some difficulty defeating the opponents, but was really the most difficult was trying to defeat Gorga with all those energy circle things on the floor, the cable and constantly trying (and failing) to get to those med things to heal myself in time, I'm starting to think it's impossible to defeat him, but I really need to catch up.

Never mind. Managed to complete it after all.

Yep, Gorga is hard. His special power is "You're dead". Not literally, but if you get hit with it you soon will be. He starts the battle with it, so you need to move out of the way before you can attack him. It's a lot of running battle. You always need to keep moving, take pot shots, and when you get those precious moments where you can bombard him with attacks since he's not using a special power do it.