As a Mobygames contributor I seem to be mostly interested in the smaller shareware/freeware independent games for DOS and Windows. At one time, between 2004 and 2006, I was working on 8-bit Nintendo games, but have recently deleted my entire collection of Abandonware and ROMS. That obviously limits my contribution potential, although it seems that there is still plenty left to do working only within the confines of legal software.
My preferred gaming platform is the Personal Computer; I've always enjoyed how it doubles as a stereo or movie machine.
RPG's & Adventure Games are my favorite genres. I enjoy epic games with a great story that do not follow the same three clichés:
inherit some legacy
track down the big foozle
save the whole world
In my view, an RPG should be open-ended rather than linear, but of course this requires much more beta-testing. I have profound respect for randomization as found in games like Nethack, Daggerfall, and Dungeon Hack. Randomization is very problematic because it opens the game to potential bugs that are difficult to track down since it is likely they will appear intermittently.