Thank you for the nice mix of answers. Obviously any good landing in such a circumstance is an excellent landing, and fab that no one got injured. A dry Hudson landing on one engine it seems to have been.
I'm aware of the unreliability of non-pilot witnesses. Probably even pilots included. I was just surprised he may have been relatively low. As a PPL i intended the question as follows (sorry English not being my mother tongue):
Would a 737 with Engine Failure on Take Off (after a single engine birdstrike) be trained to continue the climb initially to an altitude of ..... (feet) or to level off initially and immediately initiate a return to the field?