TL;DR Re:CREATORS is an original anime with a great art-style and a fantastic OST. It may have its ups and downs, but stick around til the end and you won't be disappointed.
For whatever reason, not too many seems to have watched this anime, and those that have has dropped it just one or two episodes in. While it does have a bit of a stiff start, it does pick up and quickly turns into a solid show if one just gives it a chance. The show got everything you could want from an anime: action, drama, mecha, magical girls, knights, and much more, all smashed together into one of the more unique anime there are.
What one needs to have in mind while watching, is that the lack of cohesion when it comes to the characters – their personalities, their powers, etc – is that they are supposed to have pretty much nothing in common, aside from their "anime" origins.
The series does throw you for a loop with its initial scenes. While it does have meaning and a place in the story, don't bother getting hung up on it and just continue watching.
After the first episode, you'll be in for a wild ride of action and drama. It might feel like a jumbled mishmash at first, but it does makes sense.
Setsuna is the one character that seems forced, given how the show handles introducing her, but ultimately she does end up filling an important role for the plot.
Closing statement: Meteora is best waifu, and that's final.