I would agree that of all the games I played Uncharted is one of the easiest to platinum (time & skill wise). In most platinum cases I would say the time it takes makes it a lot harder. Like Warhawk's billion hours to reach General rank.
I would rank my platinums as (from easiest to hardest):
Uncharted Drakes Fortune (time: 1 play or 6-7 hours)
Burnout Paradise (time: 15-20 hours)
Dead Space (time: 2.5 plays or 15-20 hours)
Buzz Quiz TV (time: 30-35 hours)
Call of Duty 5: World at War (time: 20 hours + many, many restarted checkpoints)
COD5 is the platinum I'm most proud of skill wise.
I'm really close to getting Little Big Planet & Prince of Persia Platinums as well. Those would fall somewhere between Dead Space and COD5.
One of the hardest platinums is WipeoutHD. Lots of skill & time go into that one. bbsin was probably seeing the whole world in slow motion after conquering that one. 
