A 2-episode arch would have been better where they explored the other shows and then in Ep. 3, things go back to mostly normal. Flash could have aired by itself for one week. Then the following week the other 3 could have started. They stagnated the launches anyhow of LoT and Supergirl. I'd have loved to see Arrow's dad as a darker Green Arrow, the Atom as mayor, Captain Cold as Star City's main hero, etc... Also, I'm not sure how they are going to integrate the Supergirl-verse into the Arrowverse, but this would have been a great way to do so with Supergirl being a government prisoner and then when things shift back, her world is now part of this new one.
But whatever... one episode of garbage is fine too.