I have no idea who the Valeyard is, but I've heard other people say the same thing this morning!
That is absolutely why I prefer Tennant (although I'll qualify that with "... so far") because he was the first Doctor to make me love the programme because I was able to identify and connect with him. However, it did make me appreciate the programme more, and I was able to view Eccleston in a new light too. Matt Smith may yet prove to be my favourite, but that will rely on the wider crew of writers, directors and producers as well as just him, as no matter how good the actor is, without the great stories and highest production values, it will never be great.