They shouldn't be anything but positive. I know Colombia has improved since Escobar was assassinated (not the footballer!) but why would anyone choose that over New York?
To tell you the truth, MLS and American soccer aren't considered that good for a Colombian. A good young player would wait for offers from either Mexico or Argentina in order to increase the chance to go to Europe, or they would wait for an European offer.
There is a huge story of successful Colombian players on the MLS, but none of then went to Europe (the aspirational dream) immediately after playing here.