Watch his SummerSlam match vs Punk, it was the 2nd best match on the card with the best match being pretty much everybody's MOTY. Brock also can sell, look at No Way Out 2004 vs Eddie, he sold his leg like the knee was broken.
You know he's paired with one of the best mic workers of all time? Heyman's a guy that will make sure this heat that Brock's getting will go to good use. Kd said it best that no-one else really on the roster could shoulder the massive amount of heat he got from beating taker. Ok, you beat taker... now what? Brock will give a rub to other guys who beat him and because he's a part-timer, the effect of that rub won't run it's course as fast, look at Henry or Kane for examples of beating them used to be a massive rub, now it's not really any of a rub.
You know this was Hunter at the helm this WM, also Taker actually calls the shots to his match. Taker chose Brock to beat him, not Vince, not Hunter, not Linda, not Steph, not anybody but Taker