So, Thing we know that he is quite strong and all, but what about Ben? What's his ability? I heard he is able to break from his shell with some weird potion. What then? What if he encounters a criminal then? Does he have any combat ability or anything at all? Or is he just a walking diploma without his rocky exterior? 

 

the potion only lasts for one week and can only be used once a year....Ben is just a normal guy when his powers are turned off

Ben was a skilled fighter who'd been on alot of Black Ops missions before he ever became a super hero.  Now I would imagine that if he lost his powers, he'd have to adjust his tactics because he's used to fighting in a body that's hard to hurt and strong as hell, but I think he's skilled enough that he can hold his own with most of the 'skilled normals' of the Marvel universe.