I agree with this. Although I had complaints about the writing in spots and predictability of the episode (even guessing a few lines verbatim), I thought it was very well done especially for a CW show. It felt more rewarding than any of the 3 episodes of Gotham I've seen, and definitely more focused. I was surprised how much I liked Gustin as the lead.
I also had a big issue with this. It's one of those cases of the writers trying to give too many winks to viewers familiar with the characters.
Also, am I the only one who hated the Arrow cameo? Or how they're framing Barry to be the Superman to Ollie's Batman? Or the fact that Ollie came up with the name? Again, it was an instance of writers trying to be too cute with the cameos.