That's true, but because of that you can get Cisco certifications, which could be helpful if you end up in an network related job. Those certifications will also give you a lot of knowledge of how networks work. (I'm currently completing a CCNA, and quite enjoy it)
A few other companies also clone the Cisco CLI, so there's that too. I wouldn't touch the Web UI if it has one though.
Welcome to networking! It's a trip I'll tell you what, especially when you get a job at a place with decade old network configs and get told to upgrade it while the group that uses it fights you tooth and nail.