Would you honestly recommend a client that their product is not of satisfactory quality & even with all the marketing it is unlikely to be successful?

The answer to the above question depends on the kind of business one wishes to do. And how long one wants to sustain a client. 

If we are looking to  retain a client for just a short term dealing or if we are aware the client isn't long term then no I would not.

However if we are to do long term business and retain a long relationship with the client then a better way to present the issue with quality would be by terming it as suggestions of what more the end customer is expecting and the benefits of the improvement being suggested with statistics to prove the growth. Hence the motivation to improve the quality.

my statement is no even though i take risk when it dont benefits my company