The honest answer? Yes, and no. Credit repair is a great way to improve your credit score, if the problem is caused by a disputable error. If your credit score is poor because of a giant pile of debt — debt that you legitimately owe — then credit repair may not be the right solution. Determining which path to take will be based upon those considerations as well as any other factors that may be unique to your situation — and this is something only you can decide.
Credit scoring models usually take into account how much you owe compared to how much credit you have available, called your credit utilization rate or your balance-to-limit ratio. Basically it's the sum of all of your revolving debt (such as your credit card balances) divided by the total credit that is available to you (or the total of all your credit limits).