You can't deny the value you get out of $15 a month, but to tell people not to complain is foolish.

Firstly, this is a public forum where SE invites people to post their opinions and criticisms about the game so they can pass them along to the dev team to see if their concerns fall in line with their design philosophy. A good amount of user feedback has actually been adopted into the game. If people didn't have a medium to voice their concerns, this game would just be created in a way in which FFXI or FFXIV 1.0 was: games in which user input was ignored and offput a lot of people and became a niche title (FFXI, despite its financial success) or a miserable failure. (1.0)

Your post was a bit general so I don't know how broad your "complainers" cover. Rapid content consumption is one thing. SE will never be able to satisfy people that play this game everyday for 8+ hours a day. People giving feedback on game systems is another can of worms and is almost always worth the dev's attention. There will almost always be opposing views regarding many of the topics here, but these things need to be discussed to hopefully make the game better.