Successful compared to what? I don't have data, but I'd venture to say that it's the most popular desktop Linux distro.

It's a bit past its peak, but in 2023 it had 7% market share in the quite lucrative North American market. That's not nothing. In North America, all other Linux distros combined just overtook ChromeOS this year. World-wide it was last year.

There's also no other Linux distro that comes pre-installed on devices from different manufacturers (at least none that I know of).