I think there are some good forex trading systems and they can make money but I like to run both manual trades and automated programs. In manual trading I still have rules but can adjust money management and other parameters and feel in control.

People who say that markets can be predicted are talking rubbish and with a technical system all you can do is react AFTER The event. A human can see the whole picture - fundamentals, sentiment, technical levels and make a judgement BEFORE the event. Don't under estimate your human brain!

Combine the Two
The choice of manual or automated trading is a personal one but my choice is a combination of the two and all my trading has manual override and in an odds based market, that's a huge advantage to have.