[xdude]

Many people are complaining that Wordpress is a security nightmare. Specially if you use plugins with it. It also tends to cause high load, not exactly something you’d want.

I wouldn’t personally recommend it. If you want a CMS, use something such as Joomla. But avoid Wordpress if you can.

I don't know who are those many people complain about Wordpress but I can't tell you the problem is on their side, not on Wordpress. Not sure how old you have used Joomla or Wordpress but I have used both since Since 2009. I don't like changes lot so I took my time before movin to Wordpress from Static. I really should have moved to Wordpress couple years before. I have dropped Joomla long time ago. It has lost the compition long time ago.

99% of Wordpress oriented problems are users fault. If it's a hacking 99% times the reason is because people using stupidly simple passwords or not keeping the site updated. A user should never use Admin as username and also always need to use at least 12 chractors as password.

Second thing :- The first you need to do after installing a fressh wordpress installation is do a speed test and mark your site speed without any themes or plugins. (Just use the default theme). Then always check the speed when installed a new theme or plugin.  Also I would only use themes/pugins from Wordpress repository. Even thats only after reading all reviews about those.

If you do those then most of those so call problems won't ever happen. In reality those high load issues rarely happen these days. Servers are quite powerful these days so those can handle. It's something really abnormals its either you have a crappy theme/plugin installed which can easily weed out or you are getting DDOSed by someone which has nothing to do with WP. I have one server where I run more than 30  avarage size Wordpress sites along with 2 big SMF forums. If I get a high load problem that usually caused by one of those forums.

Remember Wordpress is just a tool. A good one which has been built and vetted by the best in the field. If there is something wrong with your Wordpress sites then thats due to how you manage it. Otherwise  Wordpress wouldn't become crazy popular.