Based on information on the Orville's IMDB page, the most Trek cameos have yet to appear. I just hope they weren't in the episode that got punted to season 2.
As for last night's episode (and watch me tap dance around spoilers to the best of my ability) the reveal could have been handled so badly... like, heart-breakingly badly. But they did it well. Given that so far I would rate the worst Orville episode at a solid "above the middle of the pack" for Next Gen and DS9 (Samaritan Snare and Move Along Home, I am looking at you for bringing down the curve...) Firestorm may have been my favorite episode, and not just because Alara is my favorite character so far.
It was very tight story telling, and I will admit there was a point they had thrown me off the trail so hard it hurt. I like that, though, it's hard to do. I also really liked how they managed to work some humor into the episode without becoming a farce. Also, many Kudos in my mind to the doctor. Her performance is what suckered me in until almost the very end when they dropped the biggest clue.