The thing that bugs me is that I don't WANT to dislike Dimension W, that it had a decent plot & set-up, not to mention setting, but it just fails to deliver. Maybe if I check the manga out, I'll like it more since it sees to take its time with giving you details about the world & plot.
I'm totally fine with Kyoma/Mira's relationship, & I don't mind the twist that Mira's body was originally meant for Kyoma's wife. I was groaning that "oh, she's still alive, just now as Mira", but the fact someone else got his wife's body actually is alright and more plausible since, hey, someone would make use of it & they wouldn't want such a piece of technology to go to waste, and having to see a walking reminder of the fact his wife didn't get the body but someone else is a perfectly good motivator for Kyoma's dislike towards Mira. I think the issue is, again, the pacing making it hard to let us get to know them, save for one or two episodes (episode 3 is perhaps the closest we got to just getting to know them in everyday life).
Honestly, it wasn't until we got on Easter Island where I started feeling emotion towards the show....and sadly, it's more "holy crap, slow down, take your time!"
Edit: Ya know, while I'm at it, why are these mole digger kids still hanging around? They did one thing with the robot, but after that, they've just followed our heroes around, doing nothing & if anything are more of an annoyance because Mira had to save them when the floor dropped underneath them.
If anything, I feel like this is more a bad adaptation than a bad anime, but not having read the manga, I don't know how much this statement can hold truth.
