These high average guys in the low minors scare me a bit, especially if the ISO is low. Without a good scouting report, it's hard to tell whether or not he's got any plate discipline. Is he swinging at everything and just has good enough contact skills (combined with poor fields and defenders) to get a lot of hits. As those guys move up, they could get exposed and really struggle. Or they could just be really good hitters and continue to succeed. It's hard to get a good read on it.
It looks like Hamilton is taking a decent amount of walks and hitting with some pop -- both good to see.