"You were decieved." Malgus' attack on Coruscant had been a surprise as well (as the Sith waited in the shadows until their numbers grew). This time it was a very underhanded if not clever plan.

"And once again, your temple burned." Slightly metaphorically and literally.

Malgus preferred direct battle, and a full assault would have been his idea. The only time he staged a secretly executed plan was when he attempted to overtake the Sith order and declare himself Emperor. He almost succeeded.

There was a small bit of irony in how despite their grand plan, the Empire still did not fully crush the Jedi as he was currently sitting near one.

"Yet they also failed or else you would not be here." Completey eradicating the Jedi order was also part of his original plan. As they represented hope, and even one remaining could spark the fire of rebellion.