CAD is pretty terrible, and Tim can't tell a story to save his life. Most of the time, his jokes are poorly executed, and when they aren't, they usually aren't very funny. Not to say he's completely hopeless, but even a broken clock is right twice a day.
The animated series is an abonimation, and he actually expected people to pay money for that drivel. He actually explicitly stated that he would oversee any animated form of CAD to make sure it's done right, so that entire thing is his fault.
Finally, he is so unwilling to accept criticism (maybe less so now than he used to, but still) that not only does he ban people who question certain aspects of his comic from the forums (what ever happened to Scott, didn't Ethan marry a console once, loss.jpg), he has gone out of his way to remove all forms of negative criticism from places like Wikipedia and has shown his maturity further by once replacing the entire Wikipedia article for the webcomic PvP with "PvP sucks".
I won't even get into Jackie and Brittany.
