Some of its style and themes are similar to Steins;Gate, mainly the scientific conspiracy plot coupled with otaku culture, in near future SF setting. Same as S;G, it's praiseworthy that even though it's aimed a lot at otaku culture, it stays clear from fanservice. It has a decent amount of great scenes and characters, and two outstanding voice roles. Fast paced plot is also a plus, along with great production quality. One of its major problems is the blatant disregard for physics when plot feels like it, which I could overlook if earlier on series didn't insist on accurate physics to deconstruct the genre and advance the plot.
One other major problem are loose threads. Not everything gets explained by the end, some things are just blatantly overlooked. Best example is the stuff with monopoles. Don't expect that to make sense or be explained... at all. Writers just needed an excuse to violate physics, so they figured they'd make excuses randomly fall from the sky. It's almost poetic now that I think about it. On top of this, series worst offense is probably it's convoluted nature. It's almost as if J.J.Abrams himself wrote it. Just one mystery after another, overlapping with additional mysteries everywhere, and for every one that gets answered two more pop up.
As always, it results in characters doing things because the plot demands it, which often comes across feeling forced and artificial. A lot of scenes don't seem to have actual purpose (space elevator what?) and appear to be there just to be cool or mysterious or something. It defocuses the plot and makes the hard-to-follow mystery even harder to follow. Story takes a while to get going, but once it does, it's actually fun to watch for the most part, with middle section being the best part, even seeming like 9/10 at times. Too bad the ending arc pretty much destroys it and betrays any faith you put into it. There's a little bit of romance mixed in and that at least works out well enough.
