I absolutely loved everything about this mission, Scotty, how Driffen's Comet fragmented and splintered, how you got that holo-matrix for the timeline, and the story was absolutely amazing, if my list of episodes was this for bests:
Everything Old is New Again: most entertaining
Night of the Comet: best story
Cold Case: best puzzle
Everything Old is New Again: best art
the only thing I didn't enjoy about the mission was the graviton catapult, I mean when I read the instructions I thought, this'll be a cinch, great fun, and it reminded me of Star Trek IV complete with Scotty talking into the computer mouse

but it took a half an hour to actually get it right, and even then it was a fluke, I mean EASY without the time limit (which wasn't even displayed anywhere) and that it was impossible
NOT to overcorrect and overovercorrect and overoverovercorrect (you get the point) it would be easier just to have a cut-scene for that, or have an NPC take the helm, or control from the bridge and have it as a puzzle, find the right co-ordinates and engine power for each segment, it would be just as fun and much less annoying, and by the end of the mission, I was considering immediately going through with an alt, and remembered the graviton catapult WAS AT THE BEGGINING I didn't overly enjoy the exit either I mean the temporal portal generator only activates at the end but you go in with it