Abomination believe it or not isnt that high in the class 100 stakes. He's not stronger than the likes of thor, she hulk or hercules and while he's stronger than the thing the strength difference isnt significant enough for things superior fighting skills to not gain him a win.
When new enemies are introduced they are always made out to be soo much more of a threat to heroes than they actually are or will be shown to be later on down the line. Do you lot all remmeber rogues1st appearances. She took on the avengers singlehandedly. She later went on to rock the x-men taking the full brunt of storms lightning. Now that just wouldnt and couldnt happen. In the beginning Ab was hulks nemesis and he'd get the better of hulk in their initial encounters. It was his ferocity and cunning in battle which made him so dangerous to the hulk Now however he is nothing to the hulk, just like titania is now nothing to she hulk. Abomination just like collossus and namor has only recently made it into class 100. Before recent times he was considered just below that class because he could not routinely press 100 tons.