Solaris was beautiful. But it could have been more secure if it had Mandatory Access Controls. One compromised app running as root, or one privilege elevation exploit and without mandatory access controls you’re done.

Even with user contained exploits without MAC you expose way too much.

Edit: Turns out Solaris had a MAC enabled variant called Trusted Solaris! I could have seen myself using this if Sun was still around and OpenSolaris had panned out.

https://en.m.wikipedia.org/wiki/Trusted_Solaris

In conclusion Solaris was not junk.

Solaris was great until they insisted on keeping their crappy CPU for way too long before adding x86 support and lost their market share and their company.

It was a terrible gamble and they lost hard to Linux as a result.