It's extremely hard (I've found it) to identify if packet loss is a problem in your house, or with the service you're using. Also, if you don't have a baseline for how your network normally operates, everything looks like a nail when you go digging.
I was having packet loss problems every 5 seconds in a particular game where it would spike up to around 15% then recover. I ran a ping plot to the router at 0.1x per second and had absolutely no packet loss. So is it me or is it the game server.