Raw feeding is excellent, as long as you're prepared to do it properly. Either by feeding a pre-made frozen raw product (many pet shops are beginning to sell these) or by doing your research and knowing how to do it properly yourself.
Feeding a raw diet is a lot more than just giving your cat a steak and calling it a day. That kind of raw feeding IS unbalanced and would not be beneficial to your cat. They need an equal balance of meat, organ and bone (and there's debate about veggies as to how much/if any). I myself feed a pre-made raw product (100% of their diet) because I do not feel comfortable making it myself.
Feeding raw does increase possible exposure to toxoplasmosis, but that is not anything most people need be concerned about. Pregnant women and immune compromised people should not be cleaning the litter of a raw fed cat
As for worms and other bacteria, that is not a concern. Cats are meant to digest raw meat. Their systems are designed to process these things without the bacteria making them ill. Their systems are dramatically different than ours, which is why this is possible in them and not us!
If you need any more info, feel free to ask, there are lots of us "raw feeders" here on the forum with experience to share.