I love, love, love the actual card game that you play, and that alone brings it to 4 stars for me. The first hour or so, though, I was closer to 2 stars because I couldn't figure out what to do. I was told to go into my office and modify my deck, and there was a building right next to me. That's where I go, right? Nope, can't enter it. Instead I needed to hit Tab to bring up some options and from there I could get to the deck editor. Frequently it'll tell you to hit Escape to back out, but that will just bring up the main options window, right-clicking is more the right thing to do. While I haven't run into it myself I've read other reviews that warn not to play for more than an hour or so at a time, so fair warning. Honestly I think a good patch for some Quality-Of-Life and this might be an amazing game overall, hopefully that is forthcoming.
