We may not actually disagree here. The base Fiction is an incredible album. The bonus tracks don't really fit it. Below the Radiance is too bombastic (especially those opening notes), Winter Triangle and Silence in the House of Tounges are beautiful impressionist pieces, but they also don't really have a place. Fiction is its own perfect balance. It is a band showing up to get shit done: brutally, with a hint of darkness and a whole lot of music in their hearts.
So, if you're saying those songs are bad, then you are insane. If you are simply saying that they don't work with the rest of the package, then I will agree. With all DT bonus tracks, they really feel like encores to the album proper. That said, packing them in some hi-def format (CD, as opposed to pirate mp3s) is really just a delivery mechanism. Also, they fit chronologically (as opposed to later delivering a bizarre archaeological experience like Exponsures), so it's nice to see the other great ideas they had at the time that sat just outside the brilliance of the main performance. They're brilliant, but they belong on singles or EPs.