It's hard to say. Especially for the really bad teams, it doesn't necessarily take that much to make them significantly better. A couple of years ago, the White Sox were on track to be the worst team of all time. The next year, they were a reasonably OK team, with the biggest differences in rosters being a couple of players coming back from injuries.

This year, the Rockies seem like they're a much better team than last year. Last year, they were a clown show. This year, they at least seem to be a baseball team.

The Yankees are a real contender, and the Tampa Bay Rays are a perennial threat as well. Very different teams, both usually good measure. The Orioles are supposed to be much improved this year, and should be a solid team, too. The Athletics are pretty bad, and the Marlins are usually a reliable example of a go-nowhere team, too. Oh, and the Angels -- they have a few really good players, but they consistently wildly underperform as a team.