I dunno how to say. Firstly he's not a scholar, and the way he dialogues is extremely unislamic and actually gives a bad impression of islam, and he's said a lot of things that have gone against the teachings of Islam. He's also very apologetic on a lot of islamic issues
Obviously he has site in response to a specific anti-islamic site that i won't name, but becaue of the name of the site- "answering-christianity" being similar to the anti-islamic one in question, most non-muslims will think this is the muslim response to the allegations, and this is the way a muslim dialogues, and it doesn't convery the true portrait of islam. Also he stoops to the low levels of the anti-islamic counterparts by distorting and misquoting the Bible to give worse versions and views of it, which again is unislamic. He clearly has no 'ijaaza in any fields and openly has said so, and thats the reaosn i feel he should leave it to muslims with knowledge. I mean there are plenty of bro's on this site alone that can do a better job than him - Bro's Ansar Al-'Adl, Kadafi, Fi-Sab they can all do much better, and instead of allowing non-muslims to go to other sites they automatically assume this is the islamic response
Also i know of many scholars who have spoken out agianst his unislamic articles telling him to stop, and in adition to that not so long ago there was a petition going around to get him ousted urging him to step down and hand the site over to muslims of knowledge