I'd say that Thor could possibly beat Dom, but I don't think he would beat Hobbs or Shaw. Barring plot, Shaw and Hobbs both should really beat Dom, because they should be much better trained and more experienced in actual combat than Dom is, considering Dom is supposed to be, at the end of it all, a street racer who has gotten into a lot of scraps, where as Shaw is a special forces veteran, and Hobbs is a trained government agent as well.
Thor should beat Dom without much issues as long as PIS is off. Shaw and Hobbs are another matter. Thor did have problems with that big black SHIELD agent in the base so I see him having trouble with Hobbs. Shaw is fast, faster than Thor.
So I don't know. Thor has a chance to beat them, but right now I'm a bit more partial to Hobbs and Shaw.