There was a player who had absolute awesome stats and truly was a "man among boys/girls" ability wise, but his stats were even more inflated when you factored in that he was playing in a very small time league with at least one team that couldn't even field an all boys team. He threw upper 80's and many of his K's were against boys/girls who had few skills and no instruction to speak of.
It wasn't his fault where he lived, just showing how HS stats can be seriously flawed. I'm sure there are a ton of similar stories out there.
BTW, he's was drafted in the first round three years later so obviously I'm not talking about my son.
Concerning college and MLB stats, I agree that you need to know "the rest of the story". Player throw's lights out for the majority of the season, coach leaves him in on an off day to save the bullpen and ends up with an inflated ERA. I'll take him anyday.