I was under the impression that smurfs were disliked because of the pompous superiority complex and the fact that they act that way yet have very little flavor. They feel generic, even after reading books about them. When you compare them to a Legion like the Salamanders they just fall so so short its laughable. Theyre not entertaining. They try with their pseudo greek/roman thing, but they show their smurfiness here also and they dont quite make it theirs enough to add flavor. They really feel like "heres a marine with no extra nothing and everyone else is an ultramarine plus or minus some flavor in a few categories.