User blog comment:General MGD 109/His Limits/@comment-1966944-20120323005235

I have never seen any earlier implications that Grimms are more physically stronger than normal humans. They do have an enhanced perception of Wesens (although Nick occasionally misses a creature now and then, possibly due to his lack of experience thus far in using his new found skills). Aunt Marie didn't display any super human physical powers (granted she was very ill) and based on the writings of Crawford Grimm, he didn't describe or claim using any powers beyond normal humans. (Aside from aa apparent talent for behaeading or disemboweling).

That being said, what all the Grimms do seem to have and Nick is developing, is a very strong devotion to their cause of tracking down and killing Wesen, which in turn, requires them to develop a very intense mental attitude in accomplishing that goal. Its that ruthlessness in their quest, along with the Grimm reputation based on part truth and part fiction, as told to some Wesen as children, that frightens some Wesen when they encounter a Grimm. A Grimm needs an extreme mental attitude to be able to behead a creature or throw them into a flame etc. Remember, back in Aunt Marie's trailer, there is a whole slew of weapons at a Grimm's (Nick's) disposal that can also be very intimidating to any creature human or otherwise.

As for wanting him to gain any powers, I really hope the writers sort of have the mythology already laid out as to what a Grimm can or cannot do and not start adding "Superpowers" on a whim or as the "gimmick or the week."