I think there are some cases where meditation can hurt rather than help. Although it is supposed to be good for anxiety and depression, there is a slight possibility it can make things worse, at least to start with...then of course if you don't stick with it because it isn't helping you are left in nowhere land. I also wonder if it would be helpful for psychotic disorders or anyone who is prone to hallucination or anything like that. I would say for the vast majority of the populace, however, it is definitely a good thing.
Another thing to be wary of is these "open your third eye" fast or "raise your kundalini now" type meditations. I think too many people are in a rush for everything, including their spiritual evolution and I have heard the road can get bumpy if you try and do too much too fast.
Yes it can make things worse to start with because we are allowing our feelings to come fully into our awareness instead of distracting ourselves through a variety of different methods.