ugh, don't ever mention that... I'm really starting to hate Force Unleashed because of all the Force Fanboisms in the trailer alone, far more than any other Star Wars game to date, I don't mind the shockwave and push attacks etc, and even in the pre-vis trailer the guy taking out the TIE Fighter was a fair bit much imo, I mean no TIE Fighter would ever get that close during a ground Strafing Run anyhow. then there were the scenes that seemed to show an AT-AT being lifted in a similar way to what appeared to be Vader's Force Crush from Empire at War and that was ludicrous as it was. but the idea of any Jedi or Sith prior to ROTJ being powerful enough to knock an ISD from mid flight and destroy it by making it crash into the ground is out and out insanity, I mean, not even Yoda was anywhere near that Powerful. and don't tell me about what he did in the Clone Wars Cartoon, I mean come on, if the jedi were nearly as powerfull as they show Mace and Yoda in that Cartoon they woulden't have even needed the Clones in the first place, in fact, there have been a number of episodes where the Clones seem to do nothing but get in the way and the Jedi do a better job once the clones are all gone (where was mace windu's uber 1337 Martial arts powers during the Arena sequence? i'll tell you where, they didn't even exist!), the ARC Troopers and their cohorts seemed to be able to do anything other than die, the Clone Wars Cartoons depict the standard Droids as Superior to standard Clones, with Arc Troopers being only about as good as say Magnaguards if that, and Jedi such as Mace and Yoda being Gods,

even if this game is set in that alternate universe it's still insane for an Apprentice, regardless of who trained him, to be that powerful. Size might mean nothing to the force itself, and the ability to destroy a planet may be insignificant next to the power of the force BUT, the person who USES the Force is another story altogether, it took quite a bit out of Yoda to pick up Luke's X-wing, and shortened his lifespan a few years, and he struggled hard to concentrate on getting a hold of that large power conduit or whatever it was that was about to fall on Anakin and Obi-Wan on Geonosis.

the idea of a simple apprentice who isn't even a full fledged Sith etc, being able to bring down an ISD like that is more fanwank than the Imperium Class Ultra Star Destroyer... (which actually makes some semblance of sense to have a ship of that kind of profile be designed by a power hungry madman like Palpatine, as an ISD is a ship designed to subjugate a Star System, the idea behind the Imperium would be to Subjugate a whole Galaxy, carrying ISDs and even an Executor SSD or two or 3 in it's hangar bays like a normal ISD would carry TIE Fighters.)  simply because it makes no sense whatsoever that any Jedi Master or Sith Lord could possibly be, even remotely THAT powerful, let alone a secret Sith Apprentice...

that being said, nothing you see in Force Unleashed can be used to get an idea of what things in Star Wars can or can't do, just like any other Video Game, most flight sims an F-14 Tomcat can take 10 direct SAM missile hits, while in reality a single detonation of a SAM in proximity of an F-14 will kill it easily.

unless we see an ISD flying along in the Atmosphere in the live action TV series coming out in Fall 2008, than there's no reason to suspect they can, as every EU source says they can't (but then again the EU sources also say a whole load of stuff that was completely retconned with EP1-3, like the Victory Class seemingly removed from canon altogether (tho like a certain Samuel L Jackson character might say, the Absence of Evidence is not the Evidence of Absence) but the EU statement of the VSD being the largest ship that is capable of Atmospheric Flight was most certainly put to the sword in Ep3, and VSD might no longer stand for Victory Star Destroyer and now Venator Star Destroyer, but hopefully we will see a VSD in the TV series, either the newer Clone Wars Cartoon (which appears to be much more subdued and not ludicrously overpowered like the original)).
or the Live action series.

if we don't see an ISD flying in the atmosphere, especially above a City by the 2nd season of the series than i doubt we will ever see it happen in G Canon (or C Canon if forget which is the highest ranking). because once George Lucas hands off the TV Series to Kevin Smith than he will most likely Draw from the EU for storylines and plots, like maybe have Kyle Katarn and Black Sun and all them as common stuff, have Thrawn in the series (hopefully played by Jeremy Irons) and possibly Yssene Issard and so forth.

"size matters not"