I quite enjoyed this episode overall. I'll admit I was surprised how much Batman was played up for comedy, but nonetheless it was still an entertaining half-hour.
Atmospherically, this felt a lot different than previous episodes of Guess Who. I've heard that this episode was the series premiere in other countries, which leads me think maybe it was made first. I enjoyed the overall location of Wayne Manor in terms of it feeling sufficiently spooky.
Batman was an enjoyable guest star, even if he was a bit zanier this time around. I really enjoyed that they used a different villain than Joker and Penguin this time, especially given the monstrous qualities of the Man-Bat, so I was a bit disappointed that it just turned out to be the Joker again.
In terms of the characters, I thought Daphne's relation to Alfred was unnecessary. The gang being related to every single guest star on the planet doesn't seem necessary, and I wish the writers would come up with a different reason for the gang to be teaming up with these guest stars. Scooby's monologue-length comments in this episode really irritated me. I've mentioned it before, but it's so out-of-character for him to be speaking constantly. Maybe this is just me, but it bothered me that Scooby was so upset over his phone breaking, and the fact that he had a phone in the first place. It feels weird to think of Scooby obsessed with his cell phone haha.
Overall, this episode was pretty solid though it wasn't my favorite of the series. The reference to the first episode's title was fun, though the extraneous comma in the title card ("What a Night, for a Dark Knight!") is odd.
I'm not sure if this is truly the end of season 1, or if Boomerang is just calling it that. I'm not sure if anyone remembers, but with Scooby-Doo! Mystery Incorporated, Cartoon Network claimed that episode 13 was the end of season 1, and episode 14 began season 2. Officially, season 1 of SDMI lasted 26 episodes, so I'm not sure if that's the case here too.
Let's update the scoreboard for one last time this season!
1. Elementary, My Dear Shaggy! (Favorite episode)
2. When Urkel-Bots Go Bad!
3. What a Night, for a Dark Knight!
4. Attack of the Weird Al-osaurus!
5. The Cursed Cabinet of Professor Madds Markson!
6. Revenge of the Swamp Monster!
7. The Scooby of a Thousand Faces!
8. Now You Sia, Now You Don't!
9. Quit Clowning!
10. Peebles' Pet Shop of Terrible Terrors!
11. Ollie Ollie In-come Free!
12. The Fastest Food Fiend!
13. A Mystery Solving Gang Divided (Least favorite episode)
Overall, my season-end thoughts are that while I enjoyed the series, I felt the writers were trying a bit too hard sometimes to be nostalgic and it just didn't work for me. I would really like to see them try something new, or explore some new aspect of the franchise rather than just trying to make it a carbon copy of how the original show was. I don't think we'll get it with this series, but I truly hope that they choose to branch off into a different direction in the future, even if just slightly.