Ok, admittedly I was narrowly defining "riffs" in my head to exclude a lot of the melodic inter-verse stuff that defines Death of that period. If we're counting those, fine, but they're more novelty/distractions to hide the fact that in the bulk of the songs there is little to go on. It's like Annihilator; some neat and flashy harmony sections here and there, but get into the actual song and they're actually quite dull and repetitive. Well, the intro/first verse riff to Symbolic is a great to-the-point riff. I'm sure there are a few others, but otherwise the lack of quality riffing is Death's biggest fault.