I think he means better as in graphically better, not as in "mine" are better shots.
Haha, I can see what he means, though. Photomode allows you to look at things with a different perspective, instead of being limited to looking at everything from over Joel's shoulder. You can get up close to textures and character models, frame shots more artistically and focus on certain things without Joel getting in the way of the shot. For example:
Same room, no added graphical effects, yet the second image arguably looks better.