spidey is very strong and somtime even stronger
he is basicaly in CAGE or ms. Marvel class, which means less strong as the thing or collosus, but very strong, waaay stronger that captain america for one. he can press about 10-30 tons and he can beat the Hulk in tennis.
I am pretty sure that Cage and Ms. Marvel are around class 50 nowadays.
And Spider-Man always was stronger than Captain America. Faster and more agile, too. He just doesn't have his fighting skills and Cap's win-factor.