true, but it doesn't change the fact that all that media fall into EU , which tends to "exaggerate" Focre, especially video games.
Marek's Star Destroyer feat is not necessarily exagerated.
Yoda used his raw power to stop pillar and floating platform nearly instantly but Marek was channeling his power a lot longer. And channeling allows to focus on emotions and other things to gradually draw more and more on the Force. Dorsk 81 pushed 17 Star Destroyers out of Yavin system after prolonged channeling of power of 30 Jedi through him. Posted this feat in general thread:
killermovies.com/forums/showthread.php?s=&threadid=405188&from=thread&pagenumber=1381#post13986724
Let me give other reasons why Marek is more powerful. First reason is because he is darksider and they are generally are more powerful. Dooku was Jedi most of his life and, yet, he became more powerful as Sith. Anakin on two occasions overpowered Dooku by tapping into his anger. Windu's Vaapad allowed him to utilize darkside, thus making him powerful enough to defeat Sidious. Sith unlike Jedi benifit from emotions, while Jedi restrain themselves.
Marek in particular constantly strained his capabilities much more than even most other Sith and his psycho rage was boosting his power a lot.
In comparison Yoda rarely used Force and mostly passively meditated. Luke post DE, also, like Yoda used as least Force as possible and as the result he was getting fatiqued very fast.
But several factors put Luke above Yoda.
First, Luke uses positive emotions unlike Old Order which promoted no emotions. So, Luke can be Jedi without restraint drawing on Force with strong emotions like Sith.
Second, unlike Yoda, Luke was often driven into situations, where he had to exert himself like Marek. During Vong War he got back into prime because of that. First, he moved black hole and lost consciousness. Later he projected illusion of Mara's ship and concealed real one both visually and on scanners. Exertion was so strong that his face wrinkled like Palpatine's. In Swarm War he replicated this feat but it didn't age him as much because of previous exertions he got more powerful. In FotJ he strained himself on many occasions and got Force exhausted at least three times.
And third, Luke with Jacen developed techniques that allowed them to draw heavily on the Force even after getting exhausted:
"During the past year, he and Jacen had been working on overload techniques, so he could endure the pain and fatigue almost indefinitely. His body would pay a steep price, aging a year in a matter of minutes, but he knew he would not collapse."
Another Yoda's disadvantage is that because of his physical limitations he needs to draw more on the Force then others, so he gets tired faster. Also, because of his old age his body cannot indure as much strain as when he was younger. We see how Sidious abuses Force by throwing multiple platforms. And Yoda conserves his reserves by dodging all of them but last one. As Jedi he uses less Force more wisely.
I am not saying that Yoda is weak. His raw power is likely above even Sidious'. Most likely he will be able to defend against TK of Malgus, Vader and Kun. However, if constantly bombarded by TK and other powers, for all the reasons above Yoda will be the first one to get exhausted out of three Jedi.
As you see, there is a lot of reasons why it is possible for Yoda and Windu to get Force handled.