Everyone is entitled to their own opinion, whether it's negative or not. As long as your opinion is expressed in a non-offensive manner (i.e. no personal attacks), you are free to speak it.
However, this issue in particular is one that has been going on for years. From as far back as I can remember, fans have always been wanting "more", regardless of how much we release. We've done monthly updates and even weekly updates at one point, but still people complained because they weren't getting enough (more specifically, they weren't getting exactly what they want). There is no difference between then and now.
Yes, we (i.e. both fans and staff) would all wish the game was completed yesterday, but in reality, things take time and require patience. Our priority is not on continually posting screenshots or revealing massive spoilers about the game. It has never been. The only time we do release such things are during special occasions and events.
Our priority right now is on finishing the game. We will (as we always have) release information/media/dates when we decide the time is right. No amount of begging/nagging/complaining will change that, because none of those things will make development proceed any faster.
Your opinions do get passed onto the PR staff and directive staff frequently. However, repeating the same things over and over accomplishes nothing more than frustration and stress for all. Shadows is massive and requires teamwork, motivation, communication and hard work. If you are not qualified to help get the game done any faster, the best thing you can do is to just be supportive. The team appreciates praise over rantings because the former at least makes them remember why they're giving up their time for this game in the first place.
This discussion is obviously one that will never end, since you simply can't satisfy everyone 100% of the time. Thankfully, the nice thing to remember in all this is that despite whatever certain people presume about the game's progress, it continues to increase day after day.