This anime is really great! The action, the plot, and the romance are all great! This is one of the only animes that made me care about the characters and I cried at the end. I didn't want it to end. But I did have one problem, Zero Two's backstory was okay but I feel that it could've been fleshed out so much more!
Also, some common complaints about this anime is that "It's too sexual" or "They're specializing women too much" to those people I say, have you ever watched an anime before? All anime needs some fanservice every now and then.
But back to the main topic, if you want a great anime with a great love story. Watch this! :3