Yep, The NatGeo logo wins for the most annoying. Super bright yellow box distracts from the whole program. I recorded it on Fox Sports as well and the logo was top right and bright blue and white.
I thought Fox was going to be fine when the FOXHD logo faded away, but my local used the opportunity to throw a small one up the with a #tag address.
But of the three, it was the most subdued and a small cardboard cut out covered it nicely.
I'm watching on my local Fox broadcast. The history channel logo, bright yellow and huge, makes the channel annoying to watch.