I think that grammar is extremely important as well! They are just as important as communication skills, but in a sense, they are one in the same! Without proper grammar, nearly no one will be able to understand what you're trying to say. I can say this from experience, as well, because for a while I though grammar wasn't as important as well. In my Spanish 2 class, I got a bit lazy and didn't pay too much attention to grammar. In turn, I knew many phrases. In consequence of this, though, people could rarely understand what I was saying, nor did I know how to form my sentence structures correctly! Think of grammar as the medium, without it, words are almost useless!