A consistent 5ms ping time to a remote game server is almost literally impossible. That's on the order of response time you'd expect if you were on the same local network as the server itself.
For most people, just pinging their own ISP would have a response time of about 10ms. Each hop beyond that would usually add about another 5-7ms at least. A typical number of hops from a home pc to a game server would be about 10 or 15 hops.
Heck, with the CSGO servers in Seattle and DC (if you are on the US server; of course, that may not be the case), you wouldn't even be able to to ping from most of the southwest, texas, or virtually the entire midwest without breaking the speed of light (5ms*speed of light = 931 miles). And that's neglecting processing time altogether.
A 16ms lag time in LoL is also bordering on incredible.
Wonderful response times for most games is 30-40ms with average 'good' response times being much more on the order of 70-80ms.
Try a trace route. If you get 5ms responses all the way up to blizzards ping block, then you have room to complain to them. My money isn't on it.
The human eye and its brain interface, can process 10 to 12 separate (FPS) images per second, perceiving them individually.
The threshold of human visual perception varies depending on what is being measured. When looking at a lighted display, people begin to notice a brief interruption of darkness if it is about 16 milliseconds or longer.
5ms is not only technically very challenging to achieve through several hops, but also just as impossible for a human to detect by experiencing it.
Some are experiencing lag issues, some are not. I've noticed it since 3am today. Normally I would ping between 74-100 (the most) msec. While standing in town, my ping would fluctuate from 89 to 2705 to 563. Its worse in game. Its pretty much unplayable for me. I still have to submit my report to Blizz so they can fix the issue. Sucks it happened on a double bounty wkend. I'm from Toronto, Canada.
I have anywhere between 165 - 280ping/ms right now. It's just diablo, because I went into a game of League and I got 16 ping stable. In CSGO I got 5 ping stable.
What is wrong blizz?
Blizzard calculates back and forth travel. A one-way ping if you are very close to the servers and your connection is insane and stable should be around 10-20ms. Everything beyond that is either impossible or just another value. It is literally impossible to have 5ms ping in an online game today, unless you play from a university central optic fiber lane and your university is in the same city as their game servers.
Also since Blizzard calculates the latency differently, you can not compare these values easily. Most games only show the one-way "ping" which does only partially reflect the quality of your connection. Games are lying to you, only Blizzard speaks the truth.