Cthulhu Realms 9+

This game is considerably more confusing/complicated than Star Realms for two reasons. Each card has numerous rules on it, and the wording used is ambiguous at best ("conjuring" for money, "abjuration" for banishing, even using "+" or "-" sanity to indicate "bonus sanity for you" or "attack on opponent"). So the learning curve is definitely steeper.
That said, the game is quite fun once you get the hang of it.

The worst part though is the "lobby" for online play. No friends list, no list of online players, if you challenge someone who doesn't accept, you can't delete the challenge! And they can't refuse the challenge! So it just stays in your queue indefinitely as far as I can tell. That's just stupid. And then there's a bug such that if you start an online game while you already have challenges waiting, the text saying "waiting for player" is covered up by the game challenges. And you can't delete/stop the process of waiting once you start. Why doesn't this game use the Star Realms lobby system?? That one, while not the best, is still way better than this one.

Yes this isn’t Star Realms. Yes the UI might be a little cluttered looking. Yes the voice acting in the tutorial is sub-par. But it is basically still the same gameplay as Star Realms, just with its own unique twists. Personally I even prefer this game over Star Realms! It’s a shame the developers don’t seem to update this game anymore. I think it offers a fresh perspective, and the artwork & atmosphere is spot-on. Also, whoever does the voice-overs for all White Wizard games’ Campaigns, that man deserves an award or something. Dude has the perfect narrating voice. TL;DR, don’t listen to the negative reviews. If you like Lovecraft, and strategy card games, Cthulhu Realms is your ticket to ride.

This was absolutely a letdown. Don't get me wrong, in execution, it wasn't bad. It's well enough made, despite complaints I think the UI is fine.
However, the AI is terrible. Easy AI is either too easy or way too hard, and hard is actually ridiculous to the point that it seems it's less RNG and more forced difficulty.
The tutorials are fairly weak, i'd say. If I weren't knowledgable about deckbuilders already, they would have left me more lost than before. Perhaps this is just my opinion though, as I was taught in person by friends.
Overall, the harsh rating is based more on comparison to other deckbuilders than in relation to the game itself. The game itself would only get a 3.5 from me, anyways.
If you have no one to play deckbuilders with in real life, or if you are just so obsessed with them that you need to play all the time, this is for you. Otherwise, wait til game night.