I agree that complaining is valid where complaints are due. I'm just of the impression that some people are complaining about things just to complain. Some of them even complain about things that aren't even true, which seems to happen more often in recent times at other FFXIV-focused forums, and that's a shame because one starts to think that if the devs were to follow these forums, they'd be very confused and spend a lot of time weeding through false accusations and even more assumptions before they got to the actual things that are genuinely worth complaining about.
The other downside is people who might actually enjoy the game are put off entirely from all the complaints because the complainers always outvoice the people who are enjoying things (because those people are too busy enjoying the gameor can't be arsed to argue). As I said, a large poll recently had something like 75% of people still pumped for the release. But yeah, people get put off and sometimes that's not fair... they should judge for themselves instead of going by other's opinions. Lionx thinks the mouse lag is horrendous and potentially dealbreaking - I think it's better daily and over the last four or so days I think that it's no longer an issue, although he still does. It's opinion, a lot of it.
I know I should let people attack the game but everyone should equally be allowed to defend it or else the only reviews you ever read about any game would be bad ones. And that would be silly.