1) 'I like games! What games are in Fedora? I want to take a look and
get a feel for them' - I think this may be the majority case, because if
they were seeking Game X they'd search for the upstream site. So we want
to enable rapid browsing without a particular goal game in mind. 

For this i had a new idea :) I have created another mock up this time focusing on getting a feel for the games in fedora, the idea i had was to use more of a slide show / featured / spot light area at the top of the page to show users straight away what's going on in the games spin, rather than having to navigate to get info. This would also incorporate the top 10, which i have dropped from the browser.

http://fedora.splictionary.com/spotlight_and_browser.pngpng.png 

Can you think of any other scenarios?

No. 
 
- The alphabetized navigation is less important, because search is
easier to use if you know the game you want, and if you don't, category
is more fun to look through. If we drop those tabs we lose 5 tabs making
the UI much simpler (thus easier to grok!)

Agreed, when i was making the mock I was thinking it looked busy.
 

- Rather than have the sort by drop down, maybe just have tabs at the
top, similar to how we have on the front of spins.fedoraproject.org - by
popularity, by alphabetical. Maybe. Or maybe just list them by
popularity and provide a search box for people who know what they are
looking for? 

What do you think?

I think you're right, a search box would be far more beneficial that lettered tabs. I also think the method used to catalog spins on the spins.fedoraproject.org page would also suite the games spin as stats and a brief could be presented clearly. It would be much better than a screen shot in a box which wouldn't allow for much writing to be displayed.