xD I shall always support the Professor. At least in theory - if nothing more - they've got every defense possible for every class possible. If played and planned properly, they're a real pain in the donkey to deal with.
However, I've found that it gets very, very hard to execute plans against more than one opponent at a time, so I tend to prefer playing 1 on 1 duals more than anything else with them. Of course, there might be those who can play them effectively when getting teamed, but I've found that they're more designed for detailed, single target operations. A well played Professor all ready has to micromanage their skills to a degree other classes don't really need to go when it comes to a 1 on 1 battle. Trying to micromanage everything while keeping an eye on two different opponents because a strain.
Again, it's just how I can play. xD I'm not skilled enough to take on more than one person at a time without having some serious problems. Unless they're idiots, of course. xD In WoE, we also tend to be the first targeted, so trying to deal with the 4+ players raping you gets to be really challenging.