It looks blurry. Did you calculate the correct hyperfocal distance for you given aperture, focal length, and sensor size, or did you just focus at infinity (or let the camera's AF focus for you). If you focus at infinity, there's actually a little give there to focus past the point of infinity, to accommodate changes in temperature, and doing that by accident can put the image OOF.
Also, did you use manual exposure? It's important for panos that exposure stay the same throughout (making calculating correct exposure for really large panos a bit of a chore sometimes; ah well).