It can be, as long as the people running it know what they are doing. What is their track record? What are their credentials? Can you do better on your own by hiring a business coach or mentor to guide and help educate you in the fundamentals and process of business? These are some things to consider in your own due diligence before going blindly into an "incubator" scenario.
Creating a MAP will take no more than an hour of your time every month and will keep the lines of communication open, ensuring relationships with investors remain strong, and ultimately helping early-stage startups succeed.