WordPress is an utter crap in terms of DB design and code. Most plugins are even worse and the whole thing is a total mess.

Yet, if you have a client needing this and that you can have them started really quick with WordPress. Need an e-commerce? There are plugins for that. Need an event management? There are plugins. Need an obscure app for truck drivers to share their CVs and communicate with clients? There is probably a plugin for this. If there isn't, you can use one and modify it - it's all open source.

It's definitely wild and ugly and crap, and sometimes is totally pathetic but the ecosystem is huge and has everything for everyone.