I dunno Deez. Every dreamer I see on TV is something like class valedictorian, going to Yale and coming back to Texas to teach in the inner city. Or maybe an exceptional artist whose beautiful murals serve as a catalyst to a revitalized neighborhood. You have any data points to the contrary?
For meaningful analysis, I don't think it's helpful to bring up anecdotes. However, if you look for bad apples, they definitely exist. Link.
In Deezestan (the hypothetical nation in which I am the benevolent dictator), I wouldn't grant amnesty to DREAMers on a broad basis. I'd have all kinds of restrictions, and the process would be onerous.