Personally I use 90 lb dumbbells on the flat bench for reps. My barbell bench is probably in the 230-250 lbs range.
For the average man though, AT LEAST 130 lbs. Anything below that is
.
And I'm not talking none of that halfway to your chest, bouncing up and down, over in a second bullshyt.. You slowly lower the weight until it touches your chest and push it back up. A little bounce on the bottom 1/4 of the movement is fair game.
For me to consider someone IN GOOD SHAPE, they must bench at least 200 lbs. For me to consider someone STRONG, they must bench over 300 lbs.