I am buying Uncharted 3: Drake's Deception solely for the single player campaign. I pre-ordered the Special edition online, being sold at the same price as the standard edition. I enjoyed and loved Uncharted 2, but I never played Uncharted 1.
The Special edition comes with DLC packs for online. I might give the online mode a shot after I have finished the single player mode and finished off other games in my collection.