Its template system is ugly. There are projects that bring modern templating to WordPress though e.g. https://github.com/tormjens/wp-blade
Consider though that when its template system was "invented" there wasn't much else available and people back then used to mix code and html all the time (both PHP and ASP developers). In their attempt to keep it backwards compatible we still have to suffer through the template system.
Re:WordPress is now 13 years old
by connorjburton on Friday May 27, 2016 @11:27AM
(#11786607)
Timber does this too if your like your Twig. http://github.com/timber/timber
Disclamer: I'm on the dev team
Re:WordPress is now 13 years old
by mountaineer22 on Friday May 27, 2016 @11:56AM
(#11786848)
Also the http://roots.io project is pretty interesting with their "alternate" template implementation and workflow.
But maybe I just prefer writing and working in my own familiar codebases instead of spending a small amount of time in that of others, a curse that a lot of PHP developers have (the "I'll write my own framework / cms" curse)