As for the website itself, they preach false and incorrect information. They attack traditional Islam and Muslims (Ahl al-Sunna/Sunni), and they attempt to undo the very foundation of the din.
Wahhabism is an extremist sect that considers the majority of Muslims, scholars and laymen alike, to be outside the fold of Islam. Their "scholars" declare Muslims kafir, charging them with shirk and kufr, and the followers use these fatwas to fight and kill Muslims around the world. This extremist sect is funded by Saudi oil money. Young Muslims from around the world are recruited into their schools and universities, and after indoctrination, they are sent back to their homelands to spread Wahhabism/Salafism.
We must all be weary of this fitna that plagues the umma. Ahl al-Sunna/Sunni (traditional/orthodox/mainstream) Islam is represented by the four madhhabs - Hanafi, Maliki, Shafi`i, Hanbali - in jurisprudence (fiqh), by the two schools - Maturidi and Ash`ari - in beliefs (`aqida), and by the various orders (tariqas) of Tasawwuf/Sufism, the Islamic science of the purification of the heart.
Alhamdulillah, there are many great Afghan scholars whose bayans are available online. So there's no need to hear those newcombers who challenge and oppose the knowledge and piety of our great scholars.