Anakin never TRIED to take down a Star Destroyer. He had legions of ships on his side to do that kind of stuff for him.
All Star Wars evidence so far suggests that, hem hem, "Size matters not". So, if you can, say, move a cup, you can, theoretically, move a ship. The only reason it's harder is because you SEE it is harder in your own MIND!
So the only reason random unnamed apprentice dude in The Force Unleashed can do all the things he can do is because he THINKS he should be able to, because Vader raised him from a child to believe that even the "power to destroy a planet is insignificant next to the power of the Force". Being raised in such a mental condition, and possibly being psychotic (He stood up to Vader as a child. That's not bravery, that's madness) allows him to be the most dramatic Force adept ever!
...Luke would still kill him, though. Plot armour and all that. Also the fact that Vader never bother with basic lightsaber instruction (And indeed, never even gave his apprentice anything beyond a training saber. (And yes, this is my explaination for why it can't cut through flesh like a lightsaber can. It makes sense to me!!))
I now notice that I've diverged from the point of the comic severely...
I admit I've run into the same, very real problem in other games.
For instance, Empire Earth II, an ally nation sent a message that I mistook for a hostile one, and I deployed seven nuclear bombers to his cities across the map.
Turns out "negotiations" doesn't mean what I think it means. (I blame Anakin Skywalker)
