I don't understand how you could possibly think that there is filler on most Kiss albums except for these two. Some of the songs are clearly better than others, and that is consistent on every album. Considering every album by every band that I can think of, there aren't many that are packed with brilliant songs from start to finish. Typically, most greatest hits albums even feature the usual 'filler' music.
You think that the song Great Expectations from the Destroyer album is not filler?