Part 2 did suffer a bit from the Arrow's style of a lot of mumbling and brooding so I rate part 2 just a bit under part 1. Can't wait for part 3 and part 4.
Part 2 was definitely slower-paced than Part 1, but it makes sense that they needed to take a breather after all the big action and emotion of Part 1. It looks like Part 3 is probably going to have a lot of talk and exposition in the Earth-X scenes, plus the heroes' escape from the prison camp (probably with help from the resistance), alongside Iris and Felicity (and Cisco?) trying to liberate "Stalag STAR Labs," and then Part 4 will ramp things back up to full-scale team-ups and action.
I notice how much they're relying on "bottle show" techniques to save money and time for the big action. They've written it so that they can set huge swaths of Parts 2 & 3 on the standing STAR Labs sets, and it looks like much of Part 4 is on the Waverider sets. Plus there was the big rehearsal dinner at CC Jitters in Part 1. On the other hand, apparently the church interior was a specially built set -- which makes sense given all the action and destruction that had to be staged there, but it must've been really expensive.
Hmm, I wonder. The Earth-X city we saw in the teaser was recognizably an alternate version of Los Angeles or National City, since its skyline included the distinctive US Bank Tower. So I wonder if maybe we'll see a redress of the DEO sets used as the Nazi villains' HQ.