Here's what Baseball Prospectus has said about him. I don't have their 2003 comment, but here's their old comments from previous years:
Keep in mind that these comments are before he hit his wall in Triple-A. He seems like the type of hitter who needs to hit for a good batting average to be productive. Doesn't walk enough for my taste.
Hummel, a second-round pick in 2000, is a comparable player to Ray Durham but without Durham's excellent speed. A shortstop at Old Dominion, he's now a so-so second baseman who some people think will eventually move to third base. That would cloud his career prospects in this organization; leaving him at second base would give the Sox options if they can't or won't re-sign Durham at the end of the 2002 season.
A second-round pick in the 2000 draft, Old Dominion star Tim Hummel was considered by Baseball America to be one of the best pure hitters coming out of college. He’s a big guy who will probably move to third base, but the Sox are willing play him at shortstop until he proves he can’t handle it. Hummel is already one of the better players in a weak field of hitting prospects, but he’s more than a year away from entering the major-league picture.
How, then, are those people of the future—who are taking steroids every day—going to look back on baseball players who used steroids? They're going to look back on them as pioneers. They're going to look back at it and say "So what?" - Bill James, Cooperstown and the 'Roids