I've got mixed feelings about the first issue. It's got to be the exposition, but, imho, it doesn't really clarify the situation with all this cosmic stuff (or maybe I was too bored with it), and, at the same time, it doesn't give characterisations to its own characters. It's more like a combination of already existing backgrounds - which you have to be familiar with before you start reading. It might be too early for the characters to flesh out, of course, but damn, it took the whole issue for the characters to gather, just to gather and nothing else!
I can't remember where else they used Tarot cards... BTW, why does Blue Marvel have them, I thought he was more into science?
As for Loki's chaotic personality, well, that's what is sensitively missing from MCU rendition, but in Defenders it's over the top. To my mind, Loki should be unpredictable, but not because he "does what he wants" but rather because he's quick-thinking. Here, he's just giggling all the time. I guess he's happy to be free from guilt and to have an adventure, but it's not too consistent with any of his personae, even the one in the final of AoA. (Gods, I miss Kibblesmith).