Here's my ranking:
1. Uncharted 2: Among Theives (10/10)
2. Uncharted: Drake's Fortune (10/10)
3. Uncharted 3: Drakes Deception (9.8/10)
4. Uncharted 4: A Theif's End (9.6/10)
5. Uncharted: Golden Abyss (8.2/10)
1. Uncharted 4
2. Uncharted 2
3. Uncharted
4. Uncharted 3
Uncharted 2: Among Thieves (10/10)
Uncharted 4: A Thiefs End (9.5 or 10/10) need to replay
Uncharted 3: Drakes Deception (9/10) only because it has mp and co op but has slightly worse campaign than Drakes Fortune
Uncharted: Drake Fortune (9/10)
1. Uncharted 3: Drake's Deception
2. Uncharted: Drake's Fortune
3. Uncharted 2: Among Thieves
4. Uncharted 4: A Thief's End
5. Uncharted: Golden Abyss