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Well the current fuss is becasue he failed to achieve what he said.
As for 'net' benefits it depends what you mean by that. If you live in an area where the infrastructure is at breaking point, A&E, schools, plod etc etc I dont think you would see a net benefit. If you dont or are employing cheap labour at the expense of British workers then yes I am sure you will see a net benefit.
The problem is not immigration per se, it is about unctontrolled immigration. Controlled immigration is a good thing, you can match the countries requirements and balance the infrastructure to cope and spo benefit the current inhabitants and the new immigrants. Everyone is happy.
But in the EU you cannot do that. And that is the problem.
Of course the other problem is the failed multi cultural experiment of New labour that labourites seem to think could be sorted out, by someone else, in 5 years. People not integrating, refusing to use the language and creating communities that actually exclude others living in the country is very wrong and causes tension. This can and should be tackled hard.