D&D Online: The dungeons are good. Some of them are really incredible, others are fairly basic, but the first time through a dungeon feels really cool. I am certain it could be done better, but this is the best I've seen so far. Haven't played Skyrim but I suspect the dungeons are also really good in that one but if Morrowind is any indication they're somewhat samey after a while.
Has anyone made a good multiplayer Skyrim mod? As in, you could have a small handful of people running around in the same Skyrim environment?
Battlefield 1942: You can really hop into anything from jeeps and tanks to planes, submarines, battleships, aircraft carriers. Anti-air guns, anti-armor guns, MG emplacements. HOWAYVER, I would have liked to see more environmental interaction. Propane tanks exploding, destructible buildings (just make it so each building has wall and roof segments that can be destroyed individually, and if you destroy all of a certain group of segments then some of the connector pieces become destroyed), more constructible and destroyable features like bridges, barricades, tank traps. Basically,
Wolfenstein: Enemy Territory: Never played the basic game, but the mod for it by ... Splash Damage I think? ... was pretty sweet. The classes were all well-balanced, including a flamethrower and a placeable machine gun. Objectives could be built / destroyed / repaired. Lots of maps. Pretty much what I hoped for as improvement to BF1942. But of course it's not perfect: no vehicles (except occasional "escort the tank and keep it repaired" maps), the maps are the normal FPS size instead of big BF1942 maps.