Of course, I can understand that in areas where there has been a big increase in Polish workers it might seem so great if they are undercutting locals but we should ask the question: who is undercutting the locals? Who is offering less than minimum wage? (Usually a Brit - why aren't we mad about this exploitation and illegal behaviour?)
This is missing the point rather (you're not the first!).
They are not 'undercutting locals' by accepting less than minimum wage; it is because they are more than willing to work for minimum wage that they are driving wages down.
Before the rapid influx of Eastern European migrants, a low skilled job would advertise with above minimum wage to attract and get the best applicants.
In Poland (for eg) the average wage is about half the UK average wage, so the Polish migrants are more than happy to work a low skilled job for more than double what they could get in Poland.
The British folk who were filling these low skilled jobs suddenly find that where they were getting (for eg) £10 per hour before - their contracts were ended & a Polish migrant contracted instead for a couple of £ an hour less.
More importantly if your job can be stolen by someone with no contacts or language skills who has only just arrived in the country, what does that say about your employability?
Again, it's rather superior & completely out of touch to say 'look to your own employability & skills'.
If (as an employer) you had the choice of an EU migrant willing to work for the minimum wage possible, and is willing to work for minimum incentives etc, then who would you choose?
The folk who were forced out or undercut then have to accept the minimum possible and so everything stays shit for everyone, but all within the law.
Back when I was a teenager in the early 90s, I was earning up to £5 or £6 an hour doing bar work, waitressing, cleaning etc - 20 odd years later those same jobs are only paying a couple of £ more.
Shit outcome for all - and nothing to do with people being 'too good' for certain jobs or lacking in employability skills.