I'm 6'3", 220. There is nothing good about that ride! Not even the A side. The curve in the fuselage at the bottom torques the crap out of my knee. I've got about an hour in one of those planes before I start to get cranky. With the absurd way they're being utilized now, if you're on it for an hour, you're on it for three. And as bad as the seats are in the back, the jumpseat is roughly 2894288 times worse. That said, the CRJ is undoubtedly worse still.
As far as window/aisle seats:
AA 737 < CRJ1/2 < ERJ135/145 < CRJ7/9 < back of MD-80 < ERJ170/190 < front of MD-80 < 737 < A318/19/20 < 757 < WN737 < A321 < 777.