So it's not terrible for runs in general, but it's very bad for power. This article measures it as slightly above neutral for runs, but you can see much lower for home runs.
https://www.milb.com/eastern/news/x-factors-double-a-ballpark-effects/c-66868822
And you can see why a bit when you view the stadium. It's actually pretty normal on the corners (320 ft left, 325 right), and it's only 400 dead center, but it is an irregular shape, where it's depth juts out in left field and is much deeper than the pretty consistent curve shape we'd expect to see in majors.
http://www.milb.com/content/page.jsp?sid=t247&ymd=20120127&content_id=26491494&vkey=team4
And if not for Regions, southern league in general is a fairly high scoring league. So it's not like it should make you a completely terrible hitter, but your power is muted. The biggest difficulty is just AA is a huge jump.