Isn't it supposed to be a community managed site?

Question

Today two of my questions were closed.

The first as subjective and the second as off-topic. First of all, in my humble opinion, there is nothing, what so ever, subjective or off topic in these questions. Both can be clearly answered and deal with both software and hardware (I'd be grateful if you could review the questions and tell what is your opinion). However that's not the issue.

From what I know, mostly from Stack Overflow, closing and opening questions is done by voting. If enough users would have told me that I had been wrong, I'd say sorry and align to my peers. But why are there users that can single handedly close questions as off-topic? There probably should be moderators that can close questions as offending. But isn't the decision, about which question is subjective, is too subjective by itself to be decided by a single user, even if he has zillion reputation?

Quoting from The Theory of Moderation:

Moderators are human exception handlers, there to deal with those (hopefully rare) exceptional conditions that should not normally happen, but when they do, they can bring your entire program to a screaming halt, if you don’t have proper exception handling in place.

Might my questions, even if they are subjective, bring SU to a screaming halt?

Update 1: After rereading the FAQ three more times, reading the answers here and visiting the gaming site, I totally agree that the second question is both off-topic and subjective.

Update 2: I feel that this discussion deviates from its original intention. I'll created a different question that asks about the "discussion" issue.

Answer 1

Random did a good job explaining the reasoning behind closing the questions. To answer your title question:

Yes, it is community oriented and people can vote freely on Super User like you see on Stack Overflow. Moderators are the only ones who have one vote close power. You will see much more moderator interaction with questions on Super User as you may be used to the quick user responce found on Stack Overflow. Stack Overflow has many more users with vote privileges than Super User (only 112 users with 3k+ reputation as of this moment). You will see much more moderator interaction with questions on Super User because there is not a lot of 3k+ users yet. As Super User grows, you will see less moderator involvement in simple question closing and migrations.

Answer 2

Windows7 64bit for gaming

Do you have any experience with gaming on Win7 64bit?

Along with the fact that the entire question hinges on gaming activity, this last bit clinches it as off-topic for falling into the gaming and discussion holes.

Hard drives and SATA3

On the subjective close, you lead the question with some weasel words:

this is a well known fact that SSDs are faster than HDs

But then the question of where it's actually subjective and/or argumentative:

I'm wondering why to use SATA3 in hard drives at all? [...] Is it so or are there other reasons?

You're leading this into a discussion and debate on setups. SU is not about discussion nor debate.

Across the Stack Exchange network, the close votes come from the community and/or moderators. For the latter, only a single vote cast is enough to seal the deal. It's always been this way.