To be fair, Captain America, Wolverine, Abomination etc. have tangled with Hulk despite being immensely weaker than the him and the first 2 weaker than the Thing in strength and durability. On the Flip Side Hulk has fought on par with Sentry, Thor, Juggernaut, Gladiator (who fodderized the Thing) and (omg) Mephisto. Hulk has got to be the most inconsistent mainstream comic character of all time. I don't think it's best to scale characters from him most of the time.