On mobile devices, it has impressive graphics and solid performance. But, you'll need a very powerful smartphone to run it well. On my Pixel 4a it lurched and slowed at times, and the device was extremely hot. It's also simply tough to keep in the loop of all the action with such a small display especially when you want to focus on specific abilities. You can alleviate this somewhat by Diablo IV Gold playing on a tablet and using an appropriate controller. However, you can also just play with a PC.
The PC version is still not at all up to scratch, however. It's just an app for mobile on the big screen with a low resolution to the blurry textures. Animations for non-player characters are a joke, especially in the way they operate. The visual issues are not as bad as the gameplay problems. It's a mess to navigate through; rewards don't always load well; and, most important of all, your attack button could occasionally shut down but nothing more than restarting the game can resolve it. Imagine the fun when you're in the middle of the most intense dungeon crawl.
On the other hand, the sound is up to usual Diablo standards with some pleasant atmospheric background music and plenty of excellent voice acting.
I'm not averse to Diablo Immortal, but I imagine some gamers might. It's an insignificant game in a series with a long history, and the F2P mechanics buy Diablo 4 Gold are as invasive as they appear. But if (and this is a big "if") you're able to be able to get past this, there's an excellent game underneath, with satisfying gameplay and a variety of activities to pursue.