True, Camden had the 6th highest park factor for runs scored last year.  But park factors can vary greatly from year to year.  Just going by last year, Comerica and Dolphins Stadium played as hitters' parks and Rangers park played as a slight pitchers' park.  In 2005, Camden played as the 3rd best pitchers' park and in 2006 it was pretty neutral, ranking #17 in the 'runs scored' park factor.  You need to take at least a 3-yr average.  The 3-yr avg for all MLB parks are as follows:

1    Coors Field     1.198
2    Great American     1.125
3    Chase Field     1.110
4    Wrigley Field     1.087
5    Citizens Bank Park     1.086
6    Fenway Park     1.078
7    U.S. Cellular Field 1.061

8    Kauffman Stadium    1.051
9    Rangers Ballpark     1.045
10    Rogers Centre     1.016
11    Yankee Stadium     1.007
12    Miller Park     1.002
13    Dodger Stadium    1.000
14    Comerica Park     .997
15    PNC Park      .996
16    Camden Yards      .990
17    Turner Field      .984
18    AT&T Park      .983
19    Progressive Fld (Cleve.)     .982
20    Tropicana Field      .973
21    Angel Stadium      .971
22    Minute Maid Park      .961
23    Dolphin Stadium      .950
24    Metrodome      .950

25    McAfee Coliseum      .939
26    Busch Stadium      .933
27    Safeco Field      .933
28    Shea Stadium      .927
29    RFK Stadium       .892
30    Petco Park      .806

The top 7 have been above avg in runs scored each of the last 3 years so I would classify the these as hitters parks.  So the cutoff would be 6% or more above average in runs scroed to be a hitters' park.  Using this same 6% as cutoff for below average in runs scored, the bottom 6 I would classify as pitchers parks.  All of these, except McAfee, were below average in runs scored each of the last 3 years (of course, New Busch Stadium has data for only 2007).  AT&T was also, but only slightly so.  So, the middle 17 I'd classify as fairly neutral, of which Camden is one of the most neutral.

These figures actually are somewhat surprising.  Altho the NL is considered to have larger parks thatn the AL, the top 5 hitters parks are all in the NL.  But 4 of the top 5 pitchers parks also are in the NL.  Parks that are commonly considered pitchers parks, like Dolphins Stadium, Comerica, AT&T and Dodgers Stadium turn out to be fairly neutral.  Minute Maid which is commonly considered a hitter parks played as at a slight pitchers park, Rangers stadium doesnt quite make it to the hitters park category.  I also thought of Rogers Centre (SkyDome) as a hitters' park, but apparently not.  And I thought that Wrigley and Fenway actually were fairly neutral despite their reputations, but apparently their reputations are deserved to an extent.

As expected, Coors is at the top, by far the best best hitters park despite the humidor.  Also, as expected, Petco is by far the best pitchers park.  

Something to think about when you're doing your roto drafts.

Anyway, Jones will benefit some by going to Baltimore, but, as you can see, him going anywhere else in the AL would also be an improvement.