I think that "Scary immigrants come to the UK and take all our benefits and housing whilst being generally scary" is an excellent way of selling newspapers.
That doesn't mean at there are not problems but it does mean we need to be careful taking things at face value.
For example of the two people who first replied to the OP one commented on the problems of lots of young single men coming whilst the other expressed concern about the impact on labour wards. These two things can't simultaneously be true so there is some press manipulation in there.
As a country one of our biggest problems is the aging population. It really is a ticking time bomb as people are living so much longer whilst people are having less and less babies. Mass working immigration is wonderful for dealing with this problem - tax payers able to start immediately - none of the whole having to educate them to the age of 18 first lark that you would have if people just had more babies - they just turn up and start paying.
Obviously if immigrants are coming and just claiming benefits then that wouldn't happen but I'm not convinced that is true. After all we also hear a lot of stories about immigrants "stealing" our jobs so they again this is a contradiction.
Overall though I don't think that Big Dave is a person who is particularly bothered about being nice to poor Romanians - if we are staying in Europe and allowing this level of immigration and not limiting benefit access then it is because he thinks doing so will maximise his chances of re-election. His best way to do this is to do what is best for the economy.
I wouldn't trust him as far as I can throw him to do the "right thing" for anyone other than himself and his little gang of pals and for that reason strangely enough I sort of trust him!