Well, Kang has had his best showings since, that was way early in his career -before saving the multiverse, conquering 616 Earth and destroying destiny-. Kang got killed by an Ultron that Doom declared, could get past his shields, and he didn't get a shield up trying to reason with Doom instead.
In any case or form, Wonderman and Namor probably could get pass his shields, by applying Thor like strength. The question is if Kang is just going to stay there standing or if he will fight them back.