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I can see how. I own Xasthur/Leviathan and Tent Sublevel... and both have really long songs and extended nonmetal parts. I like it but I can see how others don't.I don't know how anyone could find Leviathan boring, assuming you're talking about the right one. Each release is quite different from the others, and Tentacles of Whorror is packed with variety.
I agree with this. I recently listened to Subliminal Genocide in a darkened room and it was awesome for the first few songs, but it began to drag towards the end of the album.I could see how Xasthur could be boring to many. The main problem with basically all Xasthur albums is a poor sense of pacing and balance. The albums are all too long, and usually aren't put together in a listenable way. The result is that I'll either pick out Xasthur tracks or listen to the first half of an album. The splits are more successful because they feel so much more like a whole rather than "here are some songs I wrote between date x and y".
Also for good, nonstandard sounding USBM check out Nachtmystium - Instinct: Decay. It's my top album of 2006.