I have tried to like tiling window managers and for whatever reason, it just hasn't clicked for me. I have really come to like the way default Gnome works. That said, I have used material-shell for about 1/2 an hour, and so far this is the first time I can see myself actually liking a tiling window manager.
At the risk of being the guy who has used it for a minimal amount of time and starts complaining about it because it doesn't work like I'm used to...There are a couple preference things for me that I wish were a little different.
I like gnome's no-frills fullscreen. You only have the app and the top panel stuff. In material-shell, I can SUPER+ESC to get full screen, but I think I want to be able to just mouse-over to the left side to bring up the panel while in full screen. To get to anything at the panel I have to SUPER-ESC first. Which is ok, I'd just rather it optionally auto-hide.
Kind of the same as the left-panel, the top-panel workspace list looks especially jumbled when you have an app like a browser maximized. So you see the workspace list, then your titlebar, then your browser tabs. It just adds extra "business" that I would prefer to not see. And again, enabling fullscreen with SUPER+ESC basically gets me what I want so it's not that big of a deal.
Finally, I understand why people would like it, but for me I would prefer to not have the "+" in the workspace switcher at all. Or at least minimally have it skip being part of my SUPER+A/SUPER+D switching. I REALLY don't like it showing up when nothing is open on my workspace or when I have a vertical split workspace, and only one thing on the screen and it shows the "+" content window. I am so accustomed to just hitting SUPER and then typing the app that I want, its way faster to do that and I'd rather the whole "+" window go away.
All-in-all, I'm pretty satisfied with material-shell and will definitely be using it as my desktop.