I admit I am a bit biased, as I do love Avengers over MoS (which I just found to be decent).
But taking a look at the aftermath of both events, New York is still more or less standing, in fact not one building fell. Sure there will have to be a lot of work done on the buildings as they did take damage, but nothing to the extent of MoS, where buildings were falling left and right.
Plus, The Avengers do a pretty good job at trying to contain the Chitauri and the damage. Captain America even has a line about containing the battle and setting road blocks or whatever.
In
Man of Steel, Superman makes no such effort to contain the damage he and Zod inflict upon Metropolis nor makes any mention about it. There could have been a simple scene where Superman levitates above some police officers and advises them to "keep guard" or set road blocks or
something - but he never makes an effort or attempt to try and stop the destruction. If anything, his city-wide brawl with Zod inflicts even
more damage.