The 757 is just fine in the front rows and it is livable if you get a clear middle seat in the back rows.
The other thing going for the 757 is the ride. In turbulence it seems to ride better than the 320 or 737. This is likely because it is a heavier jet with bigger wings; it is also likely because it gets up higher faster than the 320 and 737, but in any case it always seems more composed and not as herky jerky and I think the PAX appreciate that fact.
Note - the -300 is s stretch to far for a narrow body. The dang thing is way to long and narrow - if you end up in a back seat, you will wait forever to get off the thing.
The -200 is GREAT!