I don't think their lyrics are that silly. There are bands that have put out super-cheesy lyrics out as well *cough Dream Theater cough cough Symphony X cough cough *. Though, I agree with the point that they can get so political it can get dull at times.
Also, Serj's recordings in the first albums rank pretty high in my "metal vocal performances" list. (No, I don't have such a list, but we would be up there if I had one)
PUSHING LITTLE CHILDREN
WITH THEIR FULLY AUTOMATICS
THEY LIKE TO PUSH THE WEAK AROUND
*destroys everything around him*