Forex is not a scam, but there are plenty of scams associated with forex.
Scams are a big problem faced by everyone in the forex industry. As with any new industry, there are plenty of people out there looking to take advantage of new comers.
Forex itself is a legitimate endeavor. Forex trading is a real business that can be profitable, but it must be treated as such. It is not a get rich overnight business, no matter what you may read elsewhere, however, it is possible to have a profitable legitimate forex business. Like any other real business though, there is no free lunch.