It's fine. By far the best-looking digital card game. Oozing with excellent animations and smooth UI interactions. Just looks and feels great all around. Not overly complicated--coming from many hours in Magic: the gathering, it's complicated in a different way, but in no way MORE complicated. Harder than Hearthstone, sure, but so is tying your shoes. Monetization is a pain as you must pay into the system to play, and it can be hard to decide to do so when the free content runs out so quickly. However, it is worth a purchase if it sounds interesting because you can turn around and sell all of your rares on the steam market and make most of the $ you invested back.
Conscious graphical style of bland and faded. Greys and browns. Interesting at first, but falls apart quickly. But really it all comes down to the combat, which is slow, clunky, unforgiving, and very, very unfun.