Pacquiao's Power UNDERrated?

Does Manny actually get his punching power underrated? Everybody says 'oh he doesn't hit that hard' but he quickly hurt the iron chinned Margarito and Mosley as well as dropping Cotto twice on one punch when otherwise Cotto has been very difficult to actually put down even when hurt. Joshua Clottey, despite not even being hit flush, also had respect for the power of Manny when using it to handicap the fight with Margarito. And of course Shane Mosley said he's never been hit as hard as when Manny hit him. In fact just recently he even said that every time Manny touched him he wobbled. Would people say 'oh Victor Ortiz doesn't hit that hard'? Because surely Manny would easily finish Berto where Ortiz couldn't. Just food for thought.