Thanks Ceetar. That's very helpful. After reading through these, I don't think the answer is very clear cut. Let's start with the easy numbers: In 2004-2008 their last 5 years at Shea, the Mets were in the top half of the league in HR's (ranked 15, 12, 7, 14, and 11). In 2009, the first year at Citi, they dropped to last in the majors. From 2009-2014 (5+ seasons) they have hovered near the bottom of the league, never rising about 23rd. Now, in 2009, they were killed with injuries, and shirley this had something to do with it, but I don't think it's a stretch to say that the park has something to do with this phenomenon. smg and Ceetar have posted numbers from fangraphs that demonstrate that Citi (since the dimension adjustment) has a positive Park Factor in terms of HR's (meaning that the Mets are more likely to hit HR's at Home than on the Road.) But we kind of knew this since many have pointed out that the Mets HR splits are not that drastic. But because Park Factor is calculated by the Home/Away splits of the guys wearing orange and blue, it cannot account for the effect, if any, that the park has on the overall performance of a hitter. magadan has suggested (and I tend to believe) that if the park is unfair, it takes a psychological toll on the hitter. The hitter develops bad habits. The hitters take the bad habits on the road with them. Suddenly, they suck everywhere. As stated above, this creates a disadvantage for the Mets since their hitters are all screwed up in the heads, while the visitors are just passing through. Unfortunately, I don't think there is any real way to measure it. There is anecdotal evidence for sure. Many players have talked about it. The manager talks about it. It makes sense in theory that if you hit a ball hard, and are not awarded with a HR, you subconsciously start swinging harder. But I don't know if there is a way this can be proven (or disproven) in any substantial way. Wright went from being an MVP caliber player, to a good (but not great, right Fred?) player. There is Bay and Granderson, and Ike Davis completely falling apart. I have a hard time convincing myself that this is all coincidental. If the park is fair (or conducive to HR's as the PF suggests), shouldn't there have been at least 1 guy in the last five years that busts out and surprises us by having a power surge?