For New Member States, what are the Drawbacks of Joining the EU?

-Removing Trade Barriers can expose Domestic Industries to a Fierce Environment, which may lead to Domestic Unemployment -Brain Drain may occur, as those who move away from the New Member States are usually those on Higher Incomes that can move away to a more Richer nation. -Complying with EU Laws may lead to Increased Costs for Firms as they have to Comply with certain Standards, as well as the Government being in Conflict as they may think this isn't the Right Path