Yes and no.
Captcha has been compromised , so some sites that include it as a forum feature to enable have had issues with it. If it's an automatic installation bit, chances are you'll have more issues than someone who does their own implementation of it. The reason behind that is the automatic or plug in ones have the source code sitting out there free to use and view - so you code around it. Whereas if you implement your unique way of doing it, the source code is unavailable for exploit - meaning that there needs to be a human involved - and spammers generally prefer to infect many sites, rather than stumble across one unique set up and make an effort (course that also depends on the site and traffic - big busy sites are worth the effort, small sites like my own aren't).