It is what it is, I will still play it, you probably will still play it. It's a video game dude, if you want in depth story telling go see a movie. I hate when people have nothing to do but spend their days complaining on the internet about a Star Wars Video Game's storyline. Where were you when they put out Republic Heroes? Many, many, many worse games out there. It's a very simple eqaution.
Palpatine= Raw Power
Starkiller= Still an apprentice
They would've known if he survived dude. They can't keep pulling the same trick out; "Oh wait Starkiller was Stabbed by a lightsaber, thrown around a room, then thrown out to space and survived. A straight duel with the Emperor in the equation and he still survives? No.