WE CAN NOT HELP ANYBODY WHO CAN NOT READ!
On the project site you can find the technical requirements.
There we point out that the GD library with true type font support must be installed on your server.
Otherwise you can not use the native captcha's.
Furthermore, Mad4Joomla does have 4 different captcha techniques. Those don't have been tested by the reviewer.
We also provide information via the F.A.Q's about issues with captcha.
At last we provide a pro version (Mooj Proforms) of Mad4Joomla. This is commercial and does support reCaptcha.
Mad4Joomla and Proforms are the same software with different names.
So talking about spending money for a decent form extension, when there is a commercial pro version (with all the missing features :) ) sounds extremly like a malicious review.