Quality of the internet

Hi, My 9-5 is working for a VoIP provider. When we started in 2006 we had a lot of issues with the quality of the internet in eastern europe and central Asia. It was not rare for us to have to play around with routing to get the quality that we needed. In a review of tickets for the last two years it seems as if we barely do any of that these days. Rarely do we get a quality complaint that comes back to an issue where a carrier or ISP dropping or mangling packets. Has anyone else observed this as well?