If you can manage one kill per sixty seconds of play, 3,000 kills takes about 50 hours. Even for the guy complaining of how little he gets to play, that's barely over two weeks of play. Some players would manage that much play in a week. Make it a more sedentary one kill per two minutes (Or 15 in a 30-minute match, fairly mediocre for a MG), and that's a month.
And what you would have there is a player dedicating a week of play to a single firearm of the game. As others have pointed out, you won't always be able to choose the german team, sometimes not even the machine gunner class, and that is a fair highly available class. What is really wrong with all this, is simply that this level of dedication is an absurd requirement. We will either get tired of repeated playstyle, or will want to participate in other ways to help your team win, or even will want to use/grind another weapon. All that also fails the fact that we won't probably play RO2 every single day, which again will drive the actual time that it takes to probably over a month or something.
Also, the requirement for the LVL50 MG34 is 3300 kills.
For some people it will take 6 hours, for others it will take weeks, months, most people who bought the game when it released still don't have it. The great majority never will.
The requirements are too damn high. Disagree all you want, as in anyone, but that is the feeling and opinion of the greater majority of people. And it makes a ton of sense, that opinion.
Also, everyone can have their opinions about this, but depending on how the system is made, on the different possible ways, come different way into how it affects the game, on the broadest of scales. A more reasonable requirement table would have the effect of making people a lot less grumpy with the system, would make more people play pvp matches without the shadow of grinding, would greatly reduce botfarming, the time people waste botfarming even if they do it, and would free a ton of content more easily into people's computers, providing more actual prolonged enjoyment of the players with RO2, probably a ton lot more than new light tanks ever would.
I'd really like to know what TWI thinks.