User Submitted Blog Posts?

I’m in the process of creating a site in which people can post their ideas for video games and how to fix currently released video games..

eg. “Man… this would be a great idea for a game!” with elaboration

I’d like to have an area seperate of the mainpage which lets any registered user post about their idea within certain categories which could be viewed in a main area and in specific category oriented views.

To elaborate:

Mainpage : Site Updates, Information etc.

Userpage: Users can post once every X hours with a minimum of X characters while relating their post to a predefined category

Categories: A page where users can view other ideas based on category of game (ie. FPS or RTS or MMORPG)

Popularity: Users can view all the user submitted posts via popularity (how many times it has been read based on clicking or how many comments it has received)

Is this possible on word press? If not… any recommendations on how I can achieve this?

An alternate way to achieve this would be to let users post within the pages mentioned but to have someone moderate each post before it is able to be viewed by frontend users.

That would take a lot more work, but might keep it more clutter free…

Thinking about it… I think using a forum would be the easiest way to implement this… any thoughts?