Mostly my problem with it is that it's buggy: frequently clicking a thread or comment chain doesn't actually load, but scrolls the screen as if it did, and other similar annoyances.

On mobile particularly if logged out (or particularly particularly if in a private browsing mode) it's quite aggressive about trying to push you to the app, or letting you view only a couple comments in a thread before saying you're not allowed to see more, or not letting you view some subs at all. "Old" reddit doesn't do any of this.