I thought they were quite good when I first got into them, but now I hardly ever listen to them. I find their death metal a bit mushy and indistinct most of the time, save for a few stand out tracks.
I like the vocals, but some of the riffs seem a bit bland, and I don't find their albums have much of a lifespan for me.
I don't think they're awful or anything - I'm sure they're worth seeing live - but I think they could have done a lot more with their sound than they have, especially the Egyptian theme.