Its wrong in the sense that Netwon's laws were wrong. It doesn't account for all the observations made after it was formulated. Specifically I'm thinking of the observations that resulted in dark matter theories (galaxies and clusters of galaxies appear to be held together by more gravity than they have mass to account for), the acceleration away from us of objects far away from us, and the "mysterious acceleration towards the sun" (MATS) that was observed with the Pioneer and Voyager spacecraft and then confirmed during the last Cassini flyby.
I confess to using the term "wrong" loosely but I'm trying to keep my comments to the short side of technical. However, you're more knowledgeable in the field. Feel free to correct my comments. (Can I get extra credit if I bring donuts?)