Lol, Malgus pwned a Jedi who collapsed two large buildings on top of him, while he was injured and after he'd held up and blasted away the rubble of those two buildings. This was before he recieved a huge boost in Deceived or became the Emperor as of Swtor. Furthermore, the caliber of the Force user's he was choking, blasting away or bringing to their knees with lightning in TOR are at or above Anakin's level. And unlike them, Anakin has only Kenobi for back up.
As to that feat, it is not as impressive as you seem to regard it as. For one thing, the dome is not as large as I think you're imagining it as. It is only the size of a basketball court in diameter. Large, but I must diagree with the text calling it enormous. As for Anakin collapsing it, well, that word speaks for itself. Anakin did not shatter or destroy the dome, he caused it to collapse. Have you not heard of a thing called structural integrity? What seems to have occurred is that Anakin damaged the dome enough that it collapsed under its own weight.
This is impressive, but at best (and I really mean AT BEST) it is only as impressive as the Zabrak Jedi who dropped two buildings on Malgus. And we know how that fight went. 😉