Bradley - to Americans - fits almost too neatly into a stereotype we all know - the hyperaggressive, hyperenthusiastic, psychotically hard working, gym rat, coach's kid. He may not be the most talented player out there, but he will absolutely be the most dedicated to learning, studying the game, working his ass off to push himself to the highest possible potential, live and die for the shirt, give you absolutely everything he has and ask for more.
I know about 4 of these guys, in various sports. Sometimes, his physical gifts won't take him beyond the Sunday pub leagues. In the U.S., in his adulthood, he's probably a coach at the local pay-to-play youth club, a fervent poster on BigSoccer, and has allegiances to clubs in each of the Big 4 leagues.
However, if you couple that approach to life with the physical gifts to play at a high level, you have a man you hate to play against and love to have in your club. Bradley not only has Premiership-level skills as a holding midfielder, he'll play as a hard man. [Poor language removed] with his'n, he'll [Poor language removed] with yours. His temper has gotten away from him a couple times - the Dutch friendly, in particular - but it seems he's gotten that settled down.
That may not be what Everton needs, but I'd rate him Everton-level quality for sure.