Well here's one thing I think a lot of people who bought this router expected. As a lot of them are FPS players, mainly COD in general. They expected to go from "Okay" lobbies, to "Great" connection lobbies. The reality is though, the Netduma will only help you in connecting to lobbies(dedicated servers) in which have as low as possible ping/latency each time. However the Netduma has ZERO control on the other player's that are connected to the same server. Plus with a game like COD, they also use "Lag Comp" still. So honestly a large part of the time, the lowest ping/latency players are at a bit of a disadvantage in most lobbies.
There isn't a one all, fix all to these type issues. But there's ways to improve things, most of it has to be done networking side, by the game developers. As only they can make it where there are limit's, in which they can set ping/latency limits that can keep certain players from being able to play on certain servers, and such. But there's a negative to this, but just because certain players have horrible connections, others shouldn't suffer because of them.
A router like the netduma with some of the features it offers, and hopefully is improved upon in the very near future with DumaOS. Are still key to have/use for people who game at home often, and want to enjoy playing online. Having things like a Geo-Filter, and a QoS system in which can control both download, and upload bandwidth, on a per device bases is key. I will honestly say having solid QoS system, properly configured is VERY key imho.
Not all QoS system's work as they should. Reason I say this, is just because you have say 100/10 internet connection. You don't want to be near maxing either download/upload limit. It's honestly key, when using a QoS system to have your limit's at like 75%, maybe even a bit lower, then what you pay for by your internet provider. Because when you near your bandwidth limit's, you greatly increase your overall ping/latency(jitter) while that bandwidth is in use.
Now back to not all QoS systems working as they should, well some QoS systems will let you set your download/upload limits. However let the lowest priority devices still use damn near the max bandwidth you have set as your limit. Which when a higher priority device request bandwidth, is supposed to be granted the bandwidth it needs, and lower priority device suffers. But this isn't always the case, and not all QoS systems work like intended. So it's important to keep your overall limit's a good bit lower then what you pay for by your provider. Because jitter becomes a real problem, when you start pushing 70-75% usage on your overall total bandwidth. One other thing, regarding some QoS systems I have seen in the past/used even. They don't handle well when wireless devices are in use, as they don't rate limit control like they should, and even priorities at times are not respected as they should.
So it's important to maintain your home network as much as possible with a solid working QoS in place. One other thing that's something outside most of our control, and I'm sure the reason some of you have purchased this router, expecting it to help/fix problems for you. That's internet issue's between the place you live, the internet modem you're using, the home's wiring, and wiring issue's in the area you live in. Which the last part would be on the ISP to fix, but is your responsibility to report to the ISP of problems with your internet. This type of stuff, there's no router out there that can help fix. You have to stay on your ISP about these type issues until they resolve them, before your quality of service ever improves.
Finally with everything I typed above, I think to many people buy a router like the Netduma. Then expect instantly they're gonna turn into the terminator, and no one should be able to kill them online, be able to get killstreak, after killstreak, and be unstoppable. Fact of the matter is.. None of us are that great, quit letting your ego play tricks on you, it's not healthy my friend. if you think you are, you're living in fantasy land. Try enjoying games a bit more, and not expect to drop 25 killstreaks every game. You will end up nothing more then disappointed, likely grumpy, and a person not many people want to play with, due to you being angry all the time.