You're talking about one year though. The UA game is almost exclusively players from the Southeast every year.....
The fact is ESPN overrates recruits from the Southeast in order to stuff their All American game with "blue chip" athletes, and Rivals tends to ignore the Midwest all together. If I had to pick a service it would be 247, with ESPN and Rivals being under Scout. So no, ESPN's recruiting service isn't legitimate, atleast not when compared to 247 or Scout....