Can you be more specific..."riffs are good in some areas, but most of the time they're nothing special whatsoever." Which songs have quality riffs, please? I'd like concrete examples so I can try and see what types of riffs you enjoy. Perhaps give me an example of riffs you like?
"The solos, while played technically well, are still the same solo's I've heard from many other bands for many years." Well, most good technically played solos involve sweeping, arpeggios, etc. The key is the emotional impact these have. Loomis shines here. His note choices and technical prowess are amazing." Listen to the solo in "Engines of Hate" or the acoustic solo in "Deconstruction."
"The songs are predictable." You think songs like "Deconstruction," "The Learning, "The politics of Ecstacy" and "42147" and "The River Dragon Has Come" are predictable? I find this to be quite the contraditcion given the list of bands you think generally "dont suck" or are "good"...IMO most of those bands even the mighty Emperor (especially the latter of their career) became extremely predticable. Side note - If you like unpredictability in music/metal, I highly suggest you listen to more Devin Townsend (solo efforts) and maybe Arcturus.
"Combine all that with absolutely atrocious singing and you have a bad band." You know, I hated Warrel's vocals at first...I really did. But the music was so good that it basically forced me to tolerate them and over time, really enjoy them. I think he has a very unique, emotional voice that isn't very "predictable" at all. All the same, I can't argue if you don't like the sound of someone's voice...