Starkiller is a terrible character so NO
I would have to second this, he is fun to play in some un-cannon game yes..... however that's it. As far as I, and many others is concerned hes just a game character. In a cannon sense, his presence ruins everything. He would in fact be the chosen one, not vader. He is far to strong and the depictions of his force powers are not consistent with established powers of the time (or at all).
Had his story taken place in 500 ABY like planned originally, then yes I would be all for this and have nothing to say about his powers.
The Force Unleashed is a great game. I love it. Cannon and movie speaking? Its heresy! - Lol. It makes no sense once-o-ever in the cannon of star wars and would never have happened.