I have heard both opinions about tablets, from a friend who is a fantastic Digital Artist, and a Traditional Artist. They were good and bad opinions both. However, I honestly want to get a tablet myself.
If you feel like it would help, I say definitely get it. It's worth trying, or what you could do is get one of the less expensive ones, and try that out, then improve. My friend who is a Digital Artist started with a cheaper tablet, and later was able to improve. I wish I could tell you one way or the other, but I have no idea. Let me ask my friend though, I'll bet she knows about it.