In my opinion what I've seen in Force Unleashed hype videos/bullshots, that's more like what I would call force... not the stupid arcane magic tricks that were supposed to be force powers in, say, KOTOR games. Apart from the Destroy Droid and Force Wave, it was always faster to just hack the living enemies to pieces with light saber/s or Baragwin assault blade+Bacca's Sword combo.
Also there is the fact that the closest to even-grounded full Force battle we've seen was between Palpatine and Yoda in Revenge. That should give a pretty good gauge at what force users can do at a battle..."So I threw the senate at him. The whole senate! True story!"
Mmm, it does seem odd considering it's set during Vaders time and he was supposed to be hugely powerful - more so even than Palpatine.
Vader at his prime was hugely more powerful than Palpatine, but I reckon being roasted and treated back to live (at least partially) reduced his biomass rather substantially, thus also reducing the available midi-chlorians in his body. Their concentration of them was still off the scale in the parts that were left so the control remained as good as always, but some of the sheer amount of force power was lost AFAIK.
Luke, though, was/is supposedly as strong as his father at his prime, considering he only lost one of his hands... the reason why Vader owned him in Empire was their huge difference in experience and thus control over the force available to them. At even ground and both using the dark side of the force, Luke was the stronger one in Return of the Jedi (and since there is no actual difference in the power of dark and light side, this should also be a reliable gauge at their relative strengths at that point, should they both have used the light side of the Force).
Curiously, even battered and tired, Vader was still strong enough to toss the Emperor to that reactor shaft (although some of that may have to be credited to him being "more machine than man" at that point), but Luke was rather helpless against the Force lightning from Palpatine. Which leads me to think that Luke simply didn't know how the hell to stop the Force lightning, seeing how relatively easy it was for both Yoda and Master Windu in Revenge.
Further down the line, in the extended universe... enter Kyp Durron, who was even more powerful then Luke and thus also stronger than Anakin, which is a lot considering that Anakin was supposedly the prophesized midi-chlorian spawn that brought balance to the force.
Anyway, I'm getting off the topic again... the red line is that Palpatine and Yoda were able to do substantial damage to the surroundings they tossed at each other. Anakin and Luke are stronger in Force, and so are some others. In that perspective, the force abilities in Force Unleashed seem more "realistic" than, say, the already mentioned magic tricks in KOTOR. I never played Dark Forces series (sigh) so I can't really say anything from there... Although I seriously doubt that Palpatine or Vader would have actually kept someone more powerful than them around as Emperor's Hand or in any other role, so there should be som pretty damn good explanation as to why the hell the main character in this game
is so strong.
And a single jedi pushing star destroyers around makes absolutely no sense at all. Except if there's a really clever plot device in it. Like saying that the ship in question was not on stabile orbit yet and the clever Jedi simply remote disabled the engines.
