There are so many mytob (and also beagle) variants that it's unlikely that the Cleaner will ever cover them.
I admit that the Virus Cleaner suffers from a serious "lack of time for updates", but - the Cleaner was meant as a simple tool to clean very common infections. I would say that recently, there are many various infections, but not very big ones. Various virus statistics show that the most popular today's worms are still the old beasts - Netsky, Zafi, ...