There's no doubt that there's a ton of great content on Disney Plus literally something for all the family. Some major movies are missing, but that's down to region restrictions and laws in specific countries, so we can't fault Disney for that.
The real problem comes with the actual player. On my TV (a recent Samsung SmartTV) the app is awful. Content stops to buffer every few seconds. Okay I don't have the fastest internet, only about 10Mb/s, but Netflix and Amazon Prime don't have these problems neither of them ever buffer. Disney is virtually unwatchable most of the time. Nothing takes you out of a movie like having the action stop-start-stop-start! It's not much better on other devices (I use iPads and MacBooks) either.
My other main quibble is the interface. The main screen for selecting shows is hard to navigate and so, so slow... thumbnails take minutes to load. There's a button to "skip recaps", but there's no way I've been able to find to actually navigate to it. And another personal bugbear is subtitles they're only available in one language for most content. Netflix manages a dozen or more.
I know all of these problems are fixable because Netflix has managed. They have a bigger catalogue, a way better interface, and no buffering or speed problems. But they also don't have Disney's shows.
I'm keeping my Disney Plus subscription going for now because it's relatively low priced, and because I hope that the app will get better over time. If it worked properly, it would be great value.