I love it. The key is setting the triggers as the left and right clicks though. I find clicking the trackpad not great for precision. There is a certain level of tinkering/customizing that will be needed to get the most out of the controls.
I've played several 20 year old FPS games with absolutely no native controller support and completed them all. If you put in a little work in getting the controls how you like them it makes it hard to play stuff without all the Steam Deck options.
If you really want to blow your mind, look up the ad campaign when they introduced Chicken Nuggets in the 1980s. It was very much inspired by tempura fried chicken, so nuggets are literally the fast food version of the kind of chicken underneath the orange chicken sauce.