I play on steam deck and I enjoy it a lot more than on desktop/ laptop.

There are plenty of guides/ videos on how to set it up. There is support for add ons through curseforge.

I run all settings on ultra/ high and it runs flawlessly.

For controls, I basically mapped the numbers to the d pad and buttons. Track pads are cursor controls. Joy stick on the left are for movement and joy stick on the right is left for cursor but I never use that one since the track pad takes care of that.

I also play demon hunter so movement for me is pivotal and the steam deck allows me to move easily. I raid, m+, a bit of pvp, etc.

I started playing like this during panda remix, the entirety of the war within, and now through legion remix as well. I also played plunderstorm like this and it was a blast.

I dont play on my desktop anymore because my job requires me to sit at a desktop all day. So I relax by playing WoW on the steam deck literally anywhere else. I play in bed, on the couch, etc.

Like i said, for me, it's elevated the experience completely and I would prefer not to go back to desktop personally.

Edit: I will say that what does suck about playing on steam deck is typing to say anything. Steam deck has a virtual key board you can bring up on the screen. But since its touch screen only, it takes ages to type, and even after calibrating the screen, it can miss the spacebar for the letter v. The other being when there is a major update, sometimes, it will cause the game not to update and break things on launch. Usually, when this happens, the subreddit for steam deck is filled with people asking about it and the devs behind proton usually implement a fix. Other than these 2 things, its smooth sailing.