Hate. Hate. Hate.
Since moving up to 147 (a division that Manny doesn't even cut weight to make weight for)
The combined record of Pacquiao's opponents is: 278-43
Of those 43 losses his opponents shared, only 3 came by way of knockout. So your opinion is flawed.
Manny is 150lbs soaking wet, and he's fighting guys who outweigh him by at least 10lbs.
Besides, I'm sure if you asked the guys who have actually taken a punch from Pacquiao if he has power, they'd tell you something completely different from what you're saying.