The ERJ is not a bad plane. I have ridden on one several times, both in back and in the flight deck jumpseat. I have heard from some who say it is not as well built as the CRJ and this may be true, but I am not a mechanic or engineer and cannot make that judgement.
I will say this: The CRJ is underpowered. We are certified to FL410 and mach .84. I have only once seen FL390 on an empty flight and only seen mach .80 in descent. When we are full, we struggle to reach FL310 and the cruise is about .76-.78. Those are not bad numbers, but the plane could use about 1000 lbs more thrust per side. Also, the cabin is a bit claustrophobic.
I have heard, though, that the 700 series fixes most of the issues with the 200. I would really like to fly the CRJ-700. Not only does it have better performance, it looks super!